PSYCH 3GG3 Lecture Notes - Lecture 5: Prenatal Development, Blastocyst, Meiosis
9 Mar 2020
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Kids aren"t the same because there are processes to shuffle the deck. meiosis the process by which sex cells (eggs and sperm) are produced. In preparation for meiosis 1, you get a crossover event. When mom and dad gametes get allocated to different cells. 4 days after conception, you get specialization (becomes a blastocyst: separated rings that will become organs and skin, cells aren"t interchangeable average lasts 12 das but ends at implantation embryonic (3rd 8th week) More likely if: already had kids, older, sufficient diet during pregnancy, varies by ethnic groups monozygotic twins. Not heritable, not related to any factors like dizygotic: seems to be random. Monozygotic twins aren"t actually identical inter-uterine environment if the have own placenta and sac, they"re in different environments. There are adaptive reasons why identical twins are not identical. It protects the fetus from toxins (what the mother eats that could harm fetus).
