9-7-10

9-7-10 - 9-7-10II. ProcessesA. Meiosos1.Process by which...

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Unformatted text preview: 9-7-10II. ProcessesA. Meiosos1.Process by which immature gametes mature and become capable of reproducing-F: eggs mature in ovaries (1 egg every 28 days). Ovulation: release of mature egg from ovary-M: Sperm mature in testes (daily). Released during ejaculation2.Determines which genes parents pass on3.Steps of meiosis:-Members of each chromosome pair line up-Each member of pair duplicates (92 chromosomes)-Crossing over segments exchange (not with XY). Creates genetic variability by making each gamete different. Each Mom/Dad can produce millions of combinations.-2 from each pair go to the right, and 2 go to left.-Cell splits into 2 unattached cells. (2 cells/ 23 pairs (46) in each cell)-1 from of each pair goes to right and 1 to left-Each cell splits into unattached cells (4 mature cells/ 23 individual chromosomes in each/ mature egg: 22 autosomes and one X chromosome/ Mature sperm: 22 autosomes and either X or Y)-End of MeiosisB. When mature sperm penetrates (fertilizes) mature egg:B....
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9-7-10 - 9-7-10II. ProcessesA. Meiosos1.Process by which...

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