compare are the changes that take place from zygote to foetus
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A zygote is the union of the sperm cell and the egg cell. Also known as a fertilized ovum, the zygote begins as a single cell but divides rapidly in the days following fertilization. After this two-week period of cell division, the zygote eventually becomes an embryo. If this goes well, the embryo becomes a fetus.
The Formation of Zygotes
In order for reproduction to take place, a single sperm cell must penetrate the outer surface of an egg. In most cases, a single egg cell is released during the ovulation phase of a woman's monthly reproductive cycle.
Normally, thousands of sperm attempt to penetrate this single egg cell. Once a single sperm has broken through the outer surface, chemical changes in the surface of the egg prevent other sperm from entering.1
This process usually happens during sexual intercourse, although medically assisted fertilization is also possible. Intrauterine insemination (IUI) and in vitro fertilization (IVF) are two commonly used assisted reproductive techniques.
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