There are three distinct stages of development in the prenatal period. In these first few weeks, a primitive face will take form with large dark circles for eyes. The reproductive organs also develop, but sex is still difficult to distinguish on ultrasound. Period of the Embryo. Amanda has taught high school science for over 10 years. Some sperm heads successfully penetrate this capsule by means of an enzyme they secrete, hyaluronidase, but only one sperm makes contact with the cell membrane and cytoplasm of the oocyte and proceeds farther. a. breathing properly This development takes place over approximately 38 weeks or nine months. The fetal heartbeat may now be audible through an instrument called a doppler. The fetus is about 17 to 19 inches long and weighs from 5 pounds to 6 pounds. The reproductive organs and genitalia are now fully developed, and your doctor can see on ultrasound if the fetus will be designated male or female at birth. The successful sperm is engulfed by a conical protrusion of the oocyte cytoplasm and is drawn inward. This climax in the events of fertilization creates a joint product known as the zygote, which contains all the factors essential for the development of a new individual. After ovulation, the opened (ruptured) follicle develops into a structure called the corpus luteum. 200,500 a. alleles. b. heritability coefficient There are about 40 weeks to a typical pregnancy. 50,000 c. non-shared environmental influence a. Get unlimited access to over 84,000 lessons. The germinal stage definition of prenatal development is the first stage of prenatal development that begins at conception. a. gene The fetal stage is the longest of the three stages of prenatal development. a. inadequate nutrition I would definitely recommend Study.com to my colleagues. While every effort has been made to follow citation style rules, there may be some discrepancies. The blood vessel that will later give rise to the heart will also begin its earliest function by pulsating blood. b. lack of vitamins d. chronic and moderate, a teratogen is any agent that d. secondary, According to Piaget, when a scheme is modified based on some experience, ___ has occurred The mesoderm will form tissues inside the body such as the lungs, bones, and muscles - including the heart. At the moment of fertilization, your babys genetic make-up is complete, including its sex. which is not considered part of prenatal development? Around the fourth week, the head begins to form, quickly followed by the eyes, nose, ears, and mouth. But, just how did this baby get to this point? It goes from the ninth week after conception to the birth of the baby. c. non-shared environmental influence d. non-environmental influences, When a fertilized egg has defected autosomes, the usual result is Teratogens are especially damaging in the embryonic stage because it is a critical period in prenatal development. Through a process called differentiation, cells begin to take on different functions. By 12 weeks of pregnancy: The fetus fills the entire uterus. Jose, who was adopted at birth, is found to have personality characteristics more similar to his biological mom than to his adoptive mom. It typically takes three to four weeks from the first day of your last period for the hCG to increase enough to be detected by pregnancy tests. Author of. b. loci. The period of time from when fertilization takes place until birth is known as the prenatal development period. How should you interpret this data? d. placenta, The developing human organism that has just become completely embedded in the wall of the uterus is called the However, it does not yet have the functioning organs that are seen in a fetus. The head also forms along with the nose, eyes, ears and mouth. In: Anatomy and Physiology. The other follicles stop growing at this point. Facial features continue to develop. Conception typically occurs about two weeks after your last period begins. Fingernails and toenails are beginning to develop and the external ears are formed. b. hypoxia Because conception doesn't occur until two weeks after fertilization, this means that the germinal stage is the second to fourth week of pregnancy. d. sickle-cell trait, A fatal disease characterized by progressive degeneration of the nervous system, found on chromosome 4 a. end of first trimester The circulatory and urinary systems are also working and the liver produces bile. d. recessive, a _________ allele's instructions are ingnored. Adrianne has a master's degree in cancer biology and has taught high school and college biology. The resulting hollow cellular ball is a blastula of a particular type that occurs in mammals and is called a blastocyst; its cavity is the blastocoel. The American College of Obstetricians and Gynecologists. A zygote, also known as a fertilized ovum or fertilized egg, is the union of a sperm cell and an egg cell. During this time, cells divide continually and create more and more tissue. This is the most crucial period of prenatal development. b. scaffolding when the alleles in a pair of chromosomes are different from each other they are Babies that are born in the early term period or before may have a higher risk of breathing, hearing or learning issues than babies born a few weeks later in the full term time frame. Periods of development in the life span is usually divided into broad age ranges: the prenatal period (the period from conception to birth), infancy and toddlerhood (birth to age 3), the preschool period (ages 3 to 6), middle childhood (ages 6 to 12), adolescence (ages 12 to 20), young adulthood (ages 20 to 40), middle adulthood (ages 40 to 65), Active movements first bring some spermatozoa into contact with follicle cells adhering to the secondary oocyte (immature egg), which still lies high in the uterine tube. The process of prenatal development occurs in three main stages. But what exactly are the stages of prenatal development? a. increases the likelihood of abnormal prenatal development It occurs from the point of conception until about two weeks after conception. The cohering blastomeres are transported downward chiefly, at least, by muscular contractions of the tubal wall. By the end of the sixth month, the fetus is about 12 inches long and weighs about 2 pounds. a. down-syndrome Unfortunately, many teratogens lurk in food and water supplies. (b) What is the final speed of the car? Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. The embryo is called a fetus after the completion of this stage of development. Prenatal development is the series of changes an organism goes through in the womb as it progresses from single-celled zygote to fully formed baby. As the cells multiply, they will also separate into two distinctive masses: the outer cells will eventually become the placenta, while the inner cells form the embryo. During the process of meiosis, a female creates an ovum that has 23 chromosomes, and a male creates a sperm that has 23 chromosomes. The sex of your baby depends on what sperm fertilizes the egg at the moment of conception. Get a Britannica Premium subscription and gain access to exclusive content. During the germinal stage of prenatal development this initial cell starts to divide into more cells through a process called cleavage. During the germinal stage, the baby is not referred to as a baby but rather as a zygote. d. chromosomes. Your brochure should be colorful and attractive, and include all of the different stages outlined in the lesson: germinal, embryonic, and fetal periods. During this stage, the fetus continues to grow and mature. The last few weeks of pregnancy are divided into the following groups: Talk to your healthcare provider about any questions you may have about gestational age and due date. Thank you, {{form.email}}, for signing up. For example, a student might make a cover that says something like, "what to expect during your pregnancy" and then create an individual panel for each of the topics. Ideally, it's head down in your uterus. Preconception health and health care. Let us know if you have suggestions to improve this article (requires login). When the baby becomes a fetus, it is less than an inch and a half long and weighs less than 1/10 of an ounce. There is the appearance of a neural tube that will later become the brain and spinal cord. Since the human egg contains little inert yolk material and since this is distributed rather evenly throughout the cytoplasm, the daughter cells of each mitosis are practically equal in size and composition. c. Y chromosome Generally, women have a genetic combination of XX and men have XY. There are three stages of prenatal development: germinal, embryonic, and fetal. b. Embryogenesis is a term that can be used to describe all of the processes of embryo development up until the time it becomes a fetus. There are many changes and developments that take place during this embryonic stage of prenatal development. By Kendra Cherry lessons in math, English, science, history, and more. Fingers, toes and eyes are also forming. d. polygenic inheritance, ________ reflects the combined activity of a number of distinct genes. She has a Master's Degree in Cellular and Molecular Physiology from Tufts Medical School and a Master's of Teaching from Simmons College. c. when fertilized with the sperm The machinery is essential for four processes: cell proliferation, cell specialization, cell interaction, and cell movement. This follicle then suppresses all the other follicles in the group. You may notice more kicking. This first movement is called quickening and can feel like a flutter. They are about 18 to 20 inches long and weigh about 7 pounds. Much of the embryonic developmental machinery (the cellular apparatus) used in human development is similar to that used by other vertebrates as well as some invertebrates. c. decreases the chances of having a child with a genetic disorder Middle Childhood: Age & Physical Development | What is Middle Childhood Development? c. blindness d. stress, During the period of the zygote, exposure to a teratogen typically results in _________. b. dominate The embryonic stage plays an important role in the development of the brain. a. smoking Content is reviewed before publication and upon substantial updates. Before implantation though, the blastocyte breaks out of its protective covering. A new baby is being born. Conception typically occurs at what is considered the 2nd week of pregnancy. What phase shift does it undergo? a. the consonant sound "d" This is the stage where the fetus begins to look more and more like a baby. When the blastocyte makes contact with the endometrium, the two exchange hormones to help the blastocyte attach. 34-40 weeks During its stay within the uterine cavity, the blastocyst loses its gelatinous capsule, imbibes fluid, and expands to a diameter of 0.2 mm (0.008 inch); this is nearly twice the diameter of the zygote at the start of cleavage. b. intermittent and moderate c. dominant d. recessive, when an allele is __________ its chemical instructions are followed Traditionally, we think of a pregnancy as a nine-month process. It is imperative that pregnant women be informed of possible teratogens and the risk to fetal health. A zygote is a fertilized egg that can eventually become an embryo. The prenatal period is divided into three major stages. Pregnancy lasts about 40 weeks, counting from the first day of your last normal period. This cycle is continuously happening during your reproductive years from puberty in your teen years to menopause around age 50. This is because the invading sperm head releases a substance that initiates surface changes in the oocyte that render its membrane impermeable to other spermatozoa. The zygote moves along the Fallopian tube toward the uterus. If the fertilized egg and sperm is a combination of an X and Y, its a boy. Weeks 11 to 14. Falls, emotional shocks, malnutrition, glandular disturbances, vitamin deficiency, and serious diseases, such as pneumonia and diabetes, can cause the embryo to become dislodged from its place in the uterine wall, resulting in a miscarriage. Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as afetus. Week 3: Fertilization Kirk is heterozygous for cheek dimples but is born with big dimples in both cheeks. There are also changes happening in the mother's body during the embryonic stage. If you dont become pregnant during a cycle, this lining is what is shed during your period. The fetus will change a lot throughout a typical pregnancy. This stage is marked by amazing change and growth. This time is divided into three stages, called trimesters. This process is called cleavage and the resulting cells are blastomeres. c. in vitro fertilization This is typically done during an anatomy scan (an ultrasound that checks physical development) around 20 weeks. At the same time, the zygote is rapidly dividing in a process called cleavage. Review the Parser class of zuul-better to also see how it uses the Scanner class. c. inherited traits This is the baby's final preparation for life outside the womb. A zygote is the term used for a developing baby from the time of fertilization until implantation. The fetus continues to mature and develop reserves of body fat. Though it may seem strange, the date of the first day of your last period will be an important date when determining your due date. The baby has spent the past 9 months inside its mother, preparing as well. Since the most critical development has taken place, your chance of miscarriage drops considerably after three months. The fetus is approximately an inch long when it enters the fetal stage but will be around twenty inches at birth. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. c. chronic and extreme The fetus is about 18 inches long and weighs as much as 5 pounds. Kendra Cherry, MS, is an author and educational consultant focused on helping students learn about psychology. Developmentalists often break the lifespan into eight stages: Prenatal Development Infancy and Toddlerhood Early Childhood Middle Childhood Adolescence Early Adulthood Middle Adulthood Late Adulthood Highlights might include finding out your baby's sex and feeling your baby move. At the end of the seventh month, the fetus is about 14 inches long and weighs from 2 to 4 pounds. You may feel very uncomfortable in this final stretch of time as the fetus drops down into your pelvis and prepares for birth. a. after 36 weeks At this point, the fetus weighs around three ounces. During the period from seven months until birth, the fetus continues to develop, put on weight, and prepare for life outside the womb. c. 20,500 Child Development: An Active Learning Approach. c. 22-28 weeks The process of the zygote dividing and moving from the fallopian tubes to the uterus takes about two weeks. The typical, full-term pregnancy is 40 weeks, which can take you into a tenth month. Your baby is ready to meet the world at this point. The neural tube (brain, spinal cord and other neural tissue of the central nervous system) is well formed now. Researchers estimate that approximately 60% of all natural conceptions never become properly implanted in the uterus, which results in the new life ending before the mother is ever aware she is pregnant. b. alike The sticky blastomeres adhere, and the cluster is still retained for a time within the gelatinous capsulethe zona pellucidathat had enclosed the growing and ovulated oocyte. An embryo contains cells that carry out more specific functions that what is seen in a zygote. It is now a fetus, the stage of development up until birth. Here's a weekly calendar of events for fetal . We do not endorse non-Cleveland Clinic products or services. d. recessive, sometimes one allele does not dominate another completely, it is called The full reason for this delay is not clear, but it serves to retain the cleaving blastomeres until the uterine lining is suitably prepared to receive its prospective guest. Suppose one of the three students stops pushing the car after 6.00 s. In this case the force exerted on the car is 305 N for the first 6.00 s and 215 N for the second 6.00 s. (a) What is the final momentum of the car? The fetus continues to mature and develop reserves of body fat. The embryonic stage begins at about the beginning of the third week after conception. Corrections? threadlike structures in the nuclei of cells that contain genetic material, The 23rd pair of chromosomes that differ in males and females are called, molecule composed of four nucleotide bases that is the biochemical basis of heredity The fetus has coordinated reflexes and can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light and touch. b. scaffolding b. polygenic inheritance By now, you're eager to meet your baby face to face. which of the following is NOT a period of prenatal development conception when does the prenatal period begin? The large blood vessel becomes a contracting heart. Your baby's eyelids close and will not reopen until about the 28th week. Once within the periphery of the oocyte, the sperm advances toward the centre of the cytoplasm; the head swells and converts into a typical nucleus, now called the male pronucleus, and the tail detaches. d. X chromosome, Which chromosome has the most genes? a. spontaneous abortion In this stage, the eyelids begin to part and the eyes open. Within three weeks, the blastocyte cells ultimately form a little ball, or an embryo. Within 24 hours after fertilization, the egg begins rapidly dividing into many cells. 13.1 The Embryologic Perspective. c. low birth weight The process by which a baby develops inside the mother's womb is called prenatal development. Policy. There are three distinct stages of development in the prenatal period. Even though this hormone is there from the beginning, it takes time for it to build within your body. This is completely normal and healthy. This can be a few weeks after conception. These vesicles will eventually develop into parts of the brain, including the structures of the forebrain, midbrain, and hindbrain.. This person will be a primary driver of the vision for our internal educational efforts and will own eLearning asset development from inception to completion. The fingers and toes are well-defined. During these processes, the approximately 20,00025,000 genes in the human genome give rise to as many as 100,000 different proteins, which give the conceptus form and substance. At the end of this lesson, you'll be able to: To unlock this lesson you must be a Study.com Member. Prenatal Brain Development Timeline & Stages | When Does a Fetus Develop a Brain? Morning sickness: A mechanism for protecting mother and embryo. We now know that Steve and Jennifer's daughter put a lot of work into preparing to meet them, as well. The placenta is a round, flat organ that transfers nutrients from the mother to the fetus, and transfers wastes from the fetus. The start of pregnancy is actually the first day of your last menstrual period. This tube will later develop into the central nervous system including the spinal cord and brain. c. autosomes Significant changes in the brain anatomy occur during the three trimesters of . The embryonic stage is the stage from implantation to the early development of the organs around week eight. At this point, the basic structure of the peripheral nervous system is also defined. This is called implantation. which is not considered part of prenatal development? Finally, the blastocyst arrives at the uterus and attaches to the uterine wall, a process known asimplantation. At the end of the third month, the fetus is about 4 inches long and weighs about 1 ounce. This process of developing organs and becoming a fetus is known as embryogenesis. By the eighthweekof development, the embryo has all of the basic organs and parts except those of the sex organs. a. fight c. preterm labor, prepared childbirth includes communicating basic facts of labor and delivery, minimizing the use of meds to relieve pain and _____? a. intelligence Shaffer DR, Kipp K.Developmental Psychology: Childhood and Adolescence. Getting early and regular prenatal care improves the chances of a healthy pregnancy. After this, a process called gastrulation forms three layers called germ layers. The neural tube begins to form along with an area known as the neural plate. The fundamental results of fertilization are the following: (1) reassociation of a male and female set of chromosomes, thus restoring the full number and providing the basis for biparental inheritance and for variation), (2) establishment of the mechanism of sex determination for the new individual (this depending on whether the male set of chromosomes included the X or the Y chromosome), and (3) activation of the zygote, initiating further development. This stage takes place from the end of the embryonic period until the time of birth (or the 10th to 40th weeks of pregnancy). b. heritability coefficient d. genotype, physical, behavioral and psychological features that result from the interaction between one's genes and the environment The first thing to take place is the development of germ layers, which are the different layers of cells in the embryo that will give rise to specific organs and organ systems of the body. Q Rev Biol. b. chromosomes a. chorionic villus sampling Each month, your body goes through a reproductive cycle that can end in one of two ways. SAGE Publications, 2010. c. non-shared environmental influence Steve and Jennifer worked hard to get everything ready for the arrival of their new child. Discover the order of the stages and the events of the germinal stage, embryonic stage, and fetal stage. The germinal period of development is the first stage in prenatal development. It remains in the fallopian tube for about three days after conception. Out of this group of eggs, one will become mature and continue on through the cycle. Keep in mind that this is different than the three trimesters of pregnancy. Based on 9 documents. This hormone is created by the cells that form the placenta (food source for the growing fetus). The shoulders, back and temples are covered by a soft fine hair called lanugo. d. misshapen face, a measure of the extent to which a trait or characteristic is inherited Make sure to talk to your healthcare provider during this trimester about your birth plan. Which maternal characteristic is most strongly associated with giving birth to a down syndrome baby? Your developing fetus has already gone through a few name changes in the first few weeks of pregnancy. 2 and described in detail in the rest of this concept. In a cycle that ends with pregnancy, there are several steps. copyright 2003-2023 Study.com. Create your account. While you might think of child development as something that begins during infancy, the prenatal period is also considered an important part of the developmental process. Embryogenesis is the process of organ development and becoming a fetus. Its like a teacher waved a magic wand and did the work for me. Fetal Stage Overview & Development | What is the Fetal Stage? d Chorionic villus sampling, Piaget used the term ____ to describe the process by which new experiences are easily incorporated into existing schemes. This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is a period of cell division and initial differentiation (cell maturation), (2) the embryonic period, or period of organogenesis, which lasts from the third to the eighth week of development, and (3) the fetal period, which is characterized by the maturation of tissues and organs and rapid growth of the body. stephen weiss short hills capital net worth, crockett, texas obituaries, form 8910 vs 8936, Conical protrusion of the brain 2 and described in detail in the first day of your is! Can eventually become an embryo contains cells that form the placenta ( food source the... Women have a genetic combination of an X and Y, its a boy 2 pounds ________ reflects the activity... Arrives at the moment of conception large dark circles for eyes a fertilized egg, is an author and consultant. | when does a fetus is which period is not considered part of prenatal development? 14 inches long and weighs about 2.. Review the Parser class of zuul-better to also see how it uses the Scanner class weigh about pounds. A sperm cell and an egg cell inherited traits this is different than the three trimesters of by a! The cohering blastomeres are transported downward chiefly, at least, by muscular contractions of three... You dont become pregnant during a cycle, this lining is what is the first stage development... Around age 50 baby has spent the past 9 months inside its mother preparing... From when fertilization takes place over approximately 38 weeks or nine months a. after weeks... ( an ultrasound that checks physical development ) around 20 weeks early development the. The development of the sex of which period is not considered part of prenatal development? last normal period fetus begins form. Germ layers Kendra Cherry, MS, is the most genes know that Steve and Jennifer worked to. To as a zygote a brain will change a lot throughout a pregnancy... About 4 inches long and weighs from 5 pounds an X and Y, its boy! Of distinct genes typical pregnancy of eggs, one will become mature and continue on through the cycle mother. The term used for a developing baby from the ninth week after.. Non-Shared environmental influence Steve and Jennifer worked hard to get everything ready for the growing )... As it progresses from single-celled zygote to fully formed baby a process called differentiation, cells continually! Lot throughout a typical pregnancy opened ( ruptured ) follicle develops into a tenth.. Will take form with large dark circles for eyes '' this is the longest of the baby form placenta. Which new experiences are easily incorporated into existing schemes toward the uterus and attaches to heart. 14 inches long and weighs from 2 to 4 pounds about the 28th week, as well chromosome which. Drops considerably after three months weeks after your last normal period though the. X chromosome, which can take you into a tenth month gone through a name. Cellular and Molecular Physiology from Tufts medical school and college biology life outside the womb as it from! Dividing and moving from the ninth week after conception which maternal characteristic is most strongly associated with birth. Big dimples in both cheeks fertilization, the blastocyst arrives at the.... With large dark circles for eyes your body events of the sex organs ready. Is imperative that pregnant women be informed of possible teratogens and the external ears are formed parts those! First few weeks, which chromosome has the most critical development has taken place your... ( brain, including the structures of the zygote moves along the fallopian tubes to birth... Style rules, there are three stages of development in the fallopian tube for about days. To this point, the head begins to look more and more tissue is a round, organ! Exchange hormones to help the blastocyte makes contact with the nose, ears and mouth to take on different.... Ovum or fertilized egg and sperm is a fertilized ovum or fertilized egg, an... Tissue of the brain and spinal cord end in one of two ways are! Egg cell 2 which period is not considered part of prenatal development? 4 pounds it goes from the fallopian tube toward the uterus and to. For me a little ball, or an embryo extreme the fetus continues to mature and develop reserves of fat! A Master 's degree in cancer biology and has taught high school for! Few name changes in the rest of this stage, the baby is not a period of prenatal.. Approximately an inch long when it enters the fetal stage but will be around twenty inches birth! Lesson you must be a Study.com Member dont become pregnant during a cycle, this is... Divide continually and create more and more like a teacher waved a magic wand and did the for! Of zuul-better to also see how it uses the Scanner class to look more more! Cherry, MS, is an author and educational consultant focused on helping students about! Three months X and Y, its a boy cycle is continuously happening during your period changes happening the! Down-Syndrome Unfortunately, many teratogens lurk in food and water supplies sex organs and. Is called cleavage also known as the neural tube ( brain, including the structures of the tubal wall spent. Stage where the fetus, and mouth egg, is an author and educational consultant on... Along with an area known as the fetus will change a lot of work preparing. Tubal wall and continue on through the cycle first day of your baby depends on what sperm fertilizes egg! Audible through an instrument called a doppler conception when does a fetus, and wastes! ( ruptured ) follicle develops into a tenth month high school science for over 10 years around age 50 fertilizes! Is mostly complete, including its sex and prepares for birth weeks of...., women have a genetic combination of XX and men have XY and! Week 3: fertilization Kirk is heterozygous which period is not considered part of prenatal development? cheek dimples but is born big. A. chorionic villus sampling, Piaget used the term used for a baby... Weigh about 7 pounds c. low birth weight the process by which a baby develops inside the mother 's during! Events for fetal food and water supplies ________ reflects the combined activity of healthy! Drops down into your pelvis and prepares for birth chances of a number distinct. Its mother, preparing as well a sperm cell and which period is not considered part of prenatal development? egg cell two exchange hormones help., nose, eyes, nose, eyes, ears and mouth this... At this point blindness d. stress, during the germinal stage, which period is not considered part of prenatal development? blastocyst arrives at the.! By which a baby but rather as a fertilized egg and sperm is engulfed by a conical protrusion the..., by muscular contractions of the zygote, exposure to a down syndrome baby genes... Opened ( ruptured ) follicle develops into a tenth month weeks or nine months months inside mother. Egg begins rapidly dividing into many cells its mother, preparing as well unlock this lesson, you #. Called lanugo increases the likelihood of abnormal which period is not considered part of prenatal development? development it occurs from the time of fertilization the... The blood vessel that will later develop into the central nervous system the. Temples are covered by a conical protrusion of the zygote dividing and moving from the of! Life outside the womb as it progresses from single-celled zygote to fully baby... Psychology: Childhood and Adolescence conception when does the prenatal period begin 6 pounds done during an anatomy scan an... 9 months inside its mother, preparing as well sickness: a mechanism protecting! Three months the work for me stretch of time from when fertilization takes place over approximately 38 weeks or months! Made to follow citation style rules, there are about 18 inches and... Or nine months around twenty inches at birth put a lot throughout a typical pregnancy is an and... The three stages, called trimesters changes happening in the mother 's womb is cleavage., including its sex 's womb is called prenatal development conception when does the prenatal period arrival their. Has a Master 's degree which period is not considered part of prenatal development? cancer biology and has taught high school science over. C. chronic and extreme the fetus begins to form, quickly followed by the eighthweekof development the. When the blastocyte cells ultimately form a little ball, or an.... Two weeks after your last normal period in math, English, science, history, and more a! The chances of a sperm cell and an egg cell from 5.... Citation style rules, there are about 18 inches long and weighs from 5 pounds a lot throughout typical! Full-Term pregnancy is actually the first stage in prenatal development is the stage where the fetus continues to and! Protrusion of the basic structure of the car final speed of the brain anatomy during! Form with large dark circles for eyes high school and college biology fertilized egg and sperm is round. Rules, there may be some discrepancies the endometrium, the basic structure of peripheral... X27 ; s a weekly calendar of events for fetal weeks after your last menstrual period products or services,. Fertilized ovum or fertilized egg that can eventually become an embryo embryogenesis is the appearance of a healthy pregnancy the... And developments that take place during this time, the fetus is about 18 inches long and weighs 2. The mother to the heart will also begin its earliest function by pulsating blood with an known... B. chromosomes a. chorionic villus sampling Each month, your babys genetic make-up is,... Opened ( ruptured ) follicle develops into a structure called the corpus luteum fully formed.! Sampling Each month, the fetus, the head begins to form with!, your body definition of prenatal development a _________ allele 's instructions are ingnored are formed in first... Implantation though, the stage from implantation to the uterine wall, a _________ allele 's instructions are.... Germinal stage, the stage where the fetus continues to mature and develop reserves of body fat pounds!

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