lecture16-slides - 10/6/09 Lecture 16 (10/2/09) Sexual...

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10/6/09 1 Lecture 16 (10/2/09) Sexual Selection I: Female Choice Paul Sherman (Note: Copyrighted photos shown in the lecture have been removed due to legal restrictions on their use) “Sexual selection depends on the success of certain individuals over others of the same sex, whilst natural selection depends on the success of both sexes in relation to the general conditions of life.” Darwin 1871, p. 398
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10/6/09 2 Regarding sexual selection, Darwin (1871, p. 398) said: “The sexual struggle is of two kinds. In the one it is between the individuals of the same sex, generally the male sex, in order to drive away or kill their rivals, the females remaining passive . . .”
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10/6/09 3 “. . . in the other kind, the struggle is likewise between the individuals of the same sex, in order to excite or charm those of the opposite sex, generally the females, which no longer remain passive, but select the more agreeable partners . . .”
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10/6/09 4 Male-male competition and female choice arise from the
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lecture16-slides - 10/6/09 Lecture 16 (10/2/09) Sexual...

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