Biology Notes 4-28-08

Biology Notes 4-28-08 - Biology Notes April 28, 2008...

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Biology Notes April 28, 2008 Reproduction: -Animal and (plant) reproduction is highly variable. Sexual Selection and reproductive success: -natural selection acts on male and female mating strategies and structures -sexual selection is natural selection for traits that specifically enhance reproductive success -differences between male and female strategies can be explained by differences between investment in sperm (pollen) and egg Males and Females: -Males - produce sperm: small, many, motile -males have a resource that is abundant and cheap. They are limited by access to females, not by ability to produce gametes -some males never father an offspring in their whole lives -Females – produce eggs: large, few, sedentary -females have a resource that is rare and expensive. They are not limited to access to male gametes that are limited by the number of eggs that they can turn into quality offspring. -usually all females can get a mate, in every species
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Biology Notes 4-28-08 - Biology Notes April 28, 2008...

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