PSYC 2290 Chapter Notes - Chapter 3: Fetal Alcohol Spectrum Disorder, Small For Gestational Age, Umbilical Cord
20 Apr 2017
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Some of the most memorable experiences are associated with pregnancy and child birth. Prenatal devp : the changes that transform a fertilized egg into a newborn human. It takes 38 weeks - divided into 3 stages : the period of the zygote, the period of embryo, the period of fetus. Period of the zygote (weeks 1 - 2) Travels along fallopian tube toward the uterus. It ends when the fertilized egg called a zygote, implants itself in the wall of the uterus. During these 2 weeks, zygote grows rapidly through cell division. Within hours, zygote divides for the first time. Sometimes, it divides into 2 clusters, which then develop into identical twins. Fraternal twins : two eggs released at same time and each is fertilized by a diff sperm cell. However many times a zygote splits, the resulting cell masses then continue to devp individually (eg : dionne sisters)
