Lec62%20Sex%20Reprod%2009

Lec62%20Sex%20Reprod%2009 - Sexual Reproduction In o...

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3/6/09 1 Sexual Reproduction In oogenesis, the primary oocyte (diploid) undergoes meiosis. How many eggs are produced from each primary oocyte? A) 1 B) 2 C) 4 D) 8 E) variable number In oogenesis, the primary oocyte (diploid) undergoes meiosis. How many eggs are produced from each primary oocyte? A) 1 B) 2 C) 4 D) 8 E) variable number * You will not be responsible for pages 1014 - 1018 Why sex? female female asexual reproduction sexual reproduction gene dilution There are obvious disadvantages The best theory is that gene shuffling aids in evolution: A) new opportunities in changing environments B) getting rid of harmful alleles But “game-playing” models indicate that this is a complex area that is not well understood.
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3/6/09 2 Sexual strategies vary a lot. sequential hermaphroditism in a wrasse. A female will become male when the male of the group dies. Damelflies mating. The male guards the female after depositing sperm. He gains by increasing the chance of fertilizing her eggs, but loses the chance to fertilize another female’s eggs. mating is competitive eg. the harem situation selects for large males (elephant seals) whereas in “monogomous” species the male/female difference is not as great
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