lecture 12-2 - III Batemans principle Energetic cost of...

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III. Bateman’s principle Energetic cost of reproduction in males is low, relative to females Male’s reproductive success limited by # of mates, not sperm production Female’s reproductive success limited by egg production, not # of mates Therefore, males should compete for mates; females should be picky a. Male-male competition (intrasexual selection) for access to females i. Leads to antlers and other features useful in ritualized or real battles among males ii. Winner gains access to resources (territories), mates b. Female choice – why do females choose what they choose? i. Good genes hypothesis 1. Sexually selected trait is honest indicator of overall good genes 2. Females choose mate they do because mates genetically superior, offspring have higher fitness ii. Handicap hypothesis 1. Handicap – deleterious trait that reduces survival 2. Hypothesis – if individual can survive despite handicap, then individual must have really good genes 3.
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