PSYC 2110 Chapter Notes - Chapter 4: Umbilical Cord, Amniotic Sac, Spina Bifida
2 Oct 2017
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Document Summary
4 major developmental processes transform a zygote into and embryo and then into a fetus. Cell division results in the proliferation of cells. Cell migration is the movement of cells from their point of origin to somewhere else in the embryo. Cell differentiation transforms the embryo"s unspecialized stem cells into different types of cells. Apoptosis genetically programmed cell death, also enables prenatal development. If sperm contributes x chromosome when it meets ovum, child will have xx pairing on. If sperm contributes y chromosome, the result will be xy pairing and will be a male. Prenatal development- the changes that transform the fertilized egg into a newborn human: prenatal development begins when a sperm fertilizes an egg. Health professionals usually measure pregnancy duration from the start of the last menstrual period, which is usually two weeks before conception; as a result, many people talk about pregnancy lasting 40 weeks.
