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Unformatted text preview: Psych0125 25/01/2008 17:49:00 Sperm Have head and tail used to swim Can sense when an egg is released Egg Nutrients surround the egg to keep it healthy Twins Identical o one egg and one sperm split o 100% genetic similarity o has to be same sex Fraternal (Dizygotic) o Two eggs and two sperm o 50% genetic similarity (just like sibilings) Semi-Identical o 70%-80% genetic similarity o one egg and two sperm Prenatal periods Germinal Period (0-2 weeks) o The Zygote (egg and sperm) is floating to the uterus wall and once it gets in there is grow for about a week o Zygote goes through mitosis (when its going down the fallopian tube into the uterus wall) o Blastocyst- created cells come out of its little shell and become two layers of cells: Trophoblast (life support) Embryoblast (baby) *if zygote does not make it into the uterus and is in the fallopian tube, it...
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This note was uploaded on 04/15/2008 for the course PSYCH 2350 taught by Professor Miller during the Spring '08 term at University of Houston.
- Spring '08