Dancing with the Stars.pdf - (Or Sexual Selection Goals(1...

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(Or Sexual Selection)
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Goals (1) Describe Bateman’s Principle (2) Explain why both types of sexual selection act mostly on males (3) Predict when and how sexual selection would act on females Part 2: Who takes responsibility for scientific integrity? Part 3: What makes someone gay?
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Darwin: “The females are most excited by, or prefer pairing with, the more ornamented males, or those which are the best songsters, or play the best antics; but it is obviously probable that they would at the same time prefer the more vigorous and lively males, and this has in some cases been confirmed by actual observation.” Origin of the Species
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Sexual selection Intrasexual selection: most common is male-male competition Intersexual selection: most common is female choice
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Bateman’s principle In species where mothers invest more in the offspring than do fathers, females are expected to be more selective in mate choice A mother elephant investing time A mother kiwi investing energy
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And so males are expected to invest more in courtship display AND the female invests more in being able to choose correctly
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Consequences of Sexual Selection
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Male Option 1 Be fabulous
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Option 2 Build or do something fabulous
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Option 3 Make more sperm* A highly polygamous species of woodmouse *(This strategy is a result of intrasexual competition)
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Huh…I wonder if there’s a link between testicle size and promiscuity in primates
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Highly promiscuous primate Monogamous primate
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ratio of testes mass to body mass testes mass (g)/body mass (kg) 0 1 2 3 4 pigmy chimp chimp human gorilla Females mate with a single male. Females mate with multiple males. ? ? From Dr. Rosie Redfield Pygmy Chimp Chimp Human Gorilla Testes/ body mass ratio
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Option 4 Make better sperm Drosophila bifurca One D. bifurca sperm (6 cm long, about 20x the length of the fly, and 11% of body mass) (Is this most likely intrasexual or intersexual competition?)
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What does the fancy stuff say about the male?
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The basic idea If you look fabulous, or are doing something fabulous, a female needs to correlate the fabulousness with underlying good genes
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Bachelor/ette A Bachelor/ette B
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‘Averaged’ faces made symmetrical.
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