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sexual_selection[1] - Primate mating Sexual selection I The...

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1 Primate mating: Sexual selection I. The peacock's tail II. Sexual selection: a definition III. Types of sexual selection A. Intrasexual selection B. Intersexual selection IV. Parental investment and sexual selection A. Sex differences in reproduction B. Sex differences in parental investment V. Sexual dimorphism in size VI. Types of female choice A. Direct material benefits - good resources B. Indirect material benefits - good genes C. Nonadaptive traits, arbitrary, aesthetic traits Male - female differences: Why??? The peacock’s tail Darwin on peacocks “The sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick!” Darwin (1887) The peacock’s tail The male mandrill’s face
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2 The male proboscis monkey’s nose The male orangutan’s cheek pads The problem The existence of structures that have no clear bearing on helping an organism to survive. Sexual selection: a definition The effects of: “a struggle between the individuals of one sex, generally the males, for possession of the other sex.”
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