PSYCH211 Chapter Notes -Facial Recognition System, Mental Model, Psych
5 Dec 2012
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When sperm penetrates the cellular wall of a egg this causes chemical changes that block any other sperm from entering. The egg and sperm are called gamete and each gamete has 23 chromosomes vs. a full set having 46 chromosomes. In vitro fertilization: mixing sperm and egg in lab dish and then placing several fertilized eggs in the mother uterus (with hope they will become implanted into the wall of the uterus) Causes increased likelihood in having twins or triplets or babies with low birth weight and defects. First 22 pairs are autosomes and the chromosomes in each pair are about the same size. 23rd pair has chromosome x much larger than chromosome y and determines the sex of the child (egg contains x and sperm contains x or y) When 23rd pair is xx=girl and when xy=boy. Each chromosome consists of one molecule of dna. Consists of a genetic code with nucleotide bases.
