PSY 302 Chapter Notes - Chapter 2: Amniotic Sac, Fetal Movement, Embryonic Stem Cell
8 May 2015
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Looking back at history, major differences in how we thought about prenatal development. Aristotle rejected idea of preformation in favour of what he termed epigenesis the emergence of new structures and functions during development. Sperm from father and egg from our mother these gametes are unique in function and that. Gametes are produced by meiosis special type of cell division in which eggs and sperm. Process of reproduction starts with launching egg from one of woman"s ovaries into adjoining. Egg moves through tube to uterus, emits chemical substance acting like a beacon to signal. Four major developmental processes underlie transformation of a zygote into an embryo and then a fetus. Rst is cell division, known as mitosis into full newborn: within 12 hrs after fertilization, zygote divides into two parts, then into four, and etc. Ii. second major process, occurring during embryonic period, is cell migration movement.
