PSYCH 2AA3 Chapter Notes - Chapter 2: In Vitro Fertilisation, Twin, Quantitative Trait Locus
15 Oct 2013
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Document Summary
Egg and sperm are gametes- have 23 chromosomes while other cells in the body have 46. 5 ml of semen is ejaculated during intercourse into the vagina releasing 200-500 million sperm- only a few hundred of these sperm actually complete the 15-20 cm journey through fallopian tubes. Louise brown created first test-tube" baby conceived in a lab dish instead of in her mother"s body. Today used more than 130 000 times in america. In vitro fertilization involves mixing sperm and egg together in a lab dish and then placing several fertilized eggs in the mother"s uterus w/i 24 hours of fertilization. Only about 1/3 of attempts at in vitro fertilization succeed, more likely to have twins, have baby with low weight or birth defects, expensive procedure. First 22 pairs of chromosomes are called autosomes and the 23rd pair determines the sex of the child xx for girl, xymale.
