Zygote divides to form which is implanted in uterus

Fertilization and implantation During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation.

All What to Expect content that addresses health or safety is medically reviewed by a team of vetted health professionals. Our MedicalReview Board includes OB/GYNs, pediatricians, infectious disease specialists, doulas, lactation counselors, endocrinologists, fertility specialists and more. We believe you should always know the source of the information you're reading.Learn more about | June 29, 2021 Your baby doesn’t magically poof! turn into an embryo immediately after conception. It goes through a whole process that you probably learned about (and possibly forgot) in your high school biology class. Central to this all is a zygote, which is what’s formed after a sperm and egg have a little rendezvous. Here’s what happens. What is a zygote? A zygote is What is the difference between a zygote and a gamete? Here’s the 411 on a gamete versus a zygote: Gametes are sex cells. They carry only one set of each chromosome, making them what's called haploid cells. Female gametes are ova or egg cells, and male gametes are sperm. When they join together to form a zygote — aha! — they’ll combine to create the full 46 chromosomes (two sets of 23, one from each gamete) needed for a full human cell. How is a zygote formed? It’s time for a little sex-ed primer: When ovaries release an egg during ovulation, it’s swept into one of your fallopian tubes, where it waits for sperm to arrive. To encourage this, the mucus in the cervix becomes more liquid and elastic, allowing sperm to reach the ...

You're pregnant. Congratulations! You'll undoubtedly spend the months ahead wondering how your baby is growing and developing. What does your baby look like? How big is he or she? When will you feel the first kick? Fetal development typically follows a predictable course. Find out what happens during the first trimester by checking out this weekly calendar of events. Keep in mind that measurements are approximate. It might seem strange, but you're not actually pregnant the first week or two of the time allotted to your pregnancy. Yes, you read that correctly! Conception typically occurs about two weeks after your last period begins. To calculate your estimated due date, your health care provider will count ahead 40 weeks from the start of your last period. This means your period is counted as part of your pregnancy — even though you weren't pregnant at the time. Fertilization and implantation During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation. The sperm and egg unite in one of your fallopian tubes to form a one-celled entity called a zygote. If more than one egg is released and fertilized or if the fertilized egg splits into two, you might have multiple zygotes. The zygote typically has 46 chromosomes — 23 from th...

Learning Objectives By the end of this section, you will be able to: • Distinguish the stages of embryonic development that occur before implantation • Describe the process of implantation • List and describe four embryonic membranes • Explain gastrulation • Describe how the placenta is formed and identify its functions • Explain how an embryo transforms from a flat disc of cells into a three-dimensional shape resembling a human • Summarize the process of organogenesis Throughout this chapter, we will express embryonic and fetal ages in terms of weeks from fertilization, commonly called conception. The period of time required for full development of a fetus in utero is referred to as gestation (gestare = “to carry” or “to bear”). It can be subdivided into distinct gestational periods. The first 2 weeks of prenatal development are referred to as the pre-embryonic stage. A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic stages of development, which are characterized by cell division, migration, and differentiation. By the end of the embryonic period, all of the organ systems are structured in rudimentary form, although the organs themselves are either nonfunctional or only semi-functional. Pre-implantation Embryonic Development Following fertilization, the zygote and its associated membranes, together referred to as the conceptus, continue to ...

There are three stages of prenatal development: the germinal, embryonic, and fetal stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period. This video has been medically reviewed by Germinal Stage of Prenatal Development The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg is called a zygote. Just a few hours after conception, the single-celled zygote begins making a journey down the fallopian tube to the uterus. Cell division begins approximately 24 to 36 hours after conception. Through the process of mitosis, the zygote first divides into two cells, then into four, eight, sixteen, and so on. A significant number of zygotes never progress past this early part of cell division, with as many as half of all zygotes surviving less than two weeks. Once the eight-cell point has been reached, the cells begin to differentiate and take on certain characteristics that will determine the type of cells they will eventually become. 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. Finally, the blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation. Implantation occurs when the cells nestle i...

What Is a Zygote? When the egg and sperm come together (a process called fertilization), they form a zygote. This is essentially a fertilized egg, says Spencer Richlin, M.D., a board-certified fertility specialist in both Obstetrics and Gynecology and Reproductive Endocrinology and Infertility, and surgical director at As it turns out, the zygote stage is over even faster than that precious newborn stage—your future little one will only be a zygote for a matter of days. But developmentally speaking, those were crucial days: even though it only contains a single cell, the zygote has all of the genetic material that will eventually turn into your baby. Zygote vs. Embryo: What's the Difference? A chromosomally normal zygote has 23 pairs of chromosomes. At the time of fertilization, it has only one cell (made when the sperm cell combines with the egg cell). "The genetic information in these cells then causes the zygote to start dividing," says Dr. Richlin. Essentially, the single cell will become two cells, then four, then eight, and so on.

Yazan Hamzeh I am an inspiring budding scientist, who currently works at a fertility unit. I graduated with BSc (honors) in Genetic Engineering from Jordan University of Science and Technology, and then pursued an MSc in Clinical Embryology at the University of Oxford where I graduated with merit. During the course of academic endeavors, I found a passion in writing, whether it being scientific writing or blog writing. Therefore, I am so glad to be a part of Study.com! I am looking forward to hopefully inspire the many budding students out there. • Instructor In sexual reproduction, male and female gametes fuse to produce a life form known as the zygote. The zygote is brought about by the fusion of sperm and egg, known as fertilization, in which the diploid number is restored to initiate new life. This occurs in the fallopian tubes, where the zygote divides to form an embryo. At five days of development, the embryo is referred to as a blastocyst. The blastocyst makes its way down to the uterus, specifically the endometrium, where it begins the process of implantation. The endometrium, which is the innermost lining of the uterus, is where the blastocyst will remain to develop until birth. Successful implantation is sometimes accompanied by a variety of signs and observations, such as spotting, nausea, bloating, headaches and increased urination. Zona Pellucida Prevents Implantation The early embryo develops as it travels down the fallopian tube While the early mammalian emb...

Sources • Bischof, Paul, and Aldo Campana. "A Model For Implantation of the Human Blastocyst and Early Placentation." Human Reproduction Update 3 (1996): 262–70. • Fukuda, Michiko, Kazuhiro Sugihara, and Jun Nakayama. "Trophinin: What Embryo Implantation Teaches Us About Human Cancer." Cancer Biology And Therapy 7:8 (2008): 1165-70. • Gilbert, Scott F. • Lee, Kevin Y., and Francisco J. DeMayo. "Animal Models of Implantation." Reproduction 128 (2004): 679–95. • Lessey, Bruce A., and Arthur J. Castelbaum. "Integrins and Implantation in the Human." Reviews in Endocrine and Metabolic Disorders 3 (2002): 107–17 . • Murray, Michael J. and Bruce A. Lessey. 1999. "Embryo Implantation and Tumor Metastasis: Common Pathways of Invasion and Angiogenesis." Seminars in Reproductive Endocrinology 17 (1999): 275–90. • Qin, Li, Yan-Ling Wang, Su-Xia Bai, Zhi-Jie Xiao, Riitta Herva, and Yun-Shang Piao. "Expression of Integrins and Extracellular Matrix Proteins at the Maternal-Fetal Interface During Tubal Implantation." Reproduction 126 (2003): 383–91. • Rogers, Peter A.W. "Current Studies on Human Implantation: A Brief Overview." Reproduction, Fertility, and Devevlopment 7 (1995): 1395–99. How to cite Wolter, Justin M., "The Process of Implantation of Embryos in Primates". Embryo Project Encyclopedia (2013-03-21). ISSN: 1940-5030 http://embryo.asu.edu/handle/10776/4935. Publisher Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia. ...

Sources • Bischof, Paul, and Aldo Campana. "A Model For Implantation of the Human Blastocyst and Early Placentation." Human Reproduction Update 3 (1996): 262–70. • Fukuda, Michiko, Kazuhiro Sugihara, and Jun Nakayama. "Trophinin: What Embryo Implantation Teaches Us About Human Cancer." Cancer Biology And Therapy 7:8 (2008): 1165-70. • Gilbert, Scott F. • Lee, Kevin Y., and Francisco J. DeMayo. "Animal Models of Implantation." Reproduction 128 (2004): 679–95. • Lessey, Bruce A., and Arthur J. Castelbaum. "Integrins and Implantation in the Human." Reviews in Endocrine and Metabolic Disorders 3 (2002): 107–17 . • Murray, Michael J. and Bruce A. Lessey. 1999. "Embryo Implantation and Tumor Metastasis: Common Pathways of Invasion and Angiogenesis." Seminars in Reproductive Endocrinology 17 (1999): 275–90. • Qin, Li, Yan-Ling Wang, Su-Xia Bai, Zhi-Jie Xiao, Riitta Herva, and Yun-Shang Piao. "Expression of Integrins and Extracellular Matrix Proteins at the Maternal-Fetal Interface During Tubal Implantation." Reproduction 126 (2003): 383–91. • Rogers, Peter A.W. "Current Studies on Human Implantation: A Brief Overview." Reproduction, Fertility, and Devevlopment 7 (1995): 1395–99. How to cite Wolter, Justin M., "The Process of Implantation of Embryos in Primates". Embryo Project Encyclopedia (2013-03-21). ISSN: 1940-5030 http://embryo.asu.edu/handle/10776/4935. Publisher Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia. ...

There are three stages of prenatal development: the germinal, embryonic, and fetal stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period. This video has been medically reviewed by Germinal Stage of Prenatal Development The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg is called a zygote. Just a few hours after conception, the single-celled zygote begins making a journey down the fallopian tube to the uterus. Cell division begins approximately 24 to 36 hours after conception. Through the process of mitosis, the zygote first divides into two cells, then into four, eight, sixteen, and so on. A significant number of zygotes never progress past this early part of cell division, with as many as half of all zygotes surviving less than two weeks. Once the eight-cell point has been reached, the cells begin to differentiate and take on certain characteristics that will determine the type of cells they will eventually become. 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. Finally, the blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation. Implantation occurs when the cells nestle i...