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In Vitro Fertilization

In Vitro Fertilization, or IVF, is one of several types of Assisted Reproductive Technology that are in wide use today to assist in the creation of a family for couples who are experiencing difficulty in conceiving a child, or in carrying the child through a full term pregnancy.

Question: How do embryos start developing after in vitro fertilization? We are doing a project on twins in my biology class and my topic is multiple births due to in vitro fertilization. And I need to find out how the embryos get started.

Answer: In a normal female, fertilization occurs in the oviduct after an ovum has been released from the ovary, and is fertilized by the sperm. This fertilized ovum then travels down the oviduct and implants itself into the endometrium (the outermost layer) of the uterus. The zygote will grow for the duration of the pregnancy here. In in-vitro fertilization, a physician will implant multiple embryos in the endometrial lining of the uterus, the opposite of the natural process. In most cases, physicians will implant more than one embryo simply to increase the chances of having one successfully implant and grow. Following implantation in the uterus, these embryos grow in the same way as all others, The zygote undergoes multiple division to form the blastocyst, and eventually cells begin differentiating and specializing.

 


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