Evolution 3b

Evolution 3b - Sexual Selection What I call Sexual...

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1 Sexual Selection “What I call Sexual Selection. . depends, not on a struggle for existence, but on a struggle between the males for [access to] the females; the result is [usually] not death to the unsuccessful competitor, but few or no offspring.” On the Origin of Species (Darwin, 1859:88) Sexual Selection • “will give characters useful to the males alone, in their struggles with other struggles with other males.” On the Origin of Species (Darwin, 1859:127)
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2 Northern Elephant Seal (Año Nuevo State Park)
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3 Here’s a male
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4 Two main aspects to sexual dimorphism: nose! (Female does not have the nose… nor do pups.)
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5 2 nd aspect: size, males can weigh 2X females
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Evolution 3b - Sexual Selection What I call Sexual...

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