Moritz7Notes - Biology 1BEvolution Lecture 7 (March 10,...

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Moritz Lecture 7 Notes - 1 Biology 1B—Evolution Lecture 7 (March 10, 2010), Sexual Selection Sexual Selection Or, competition for mates or fertilization After On the Origin of Species , Darwin wrote Descent of Man , in which he applied his theories on descent with modification to humans Essentially, his book covered selection in relation to sex Here are the known systems of mating: The systems in which males must compete for females lead to extreme competition among the males (physically or competition of their sperm) and sexual dimorphism (marked differences in appearance between males and females of the same species: think of peacocks) Darwin hypothesized about two forms of sexual selection: intrasexual and intersexual 1. Intrasexual includes male-male competition for females. This often results in body size sexual dimorphism, meaning that the males are much larger than females and often have adaptations to fight other males, i.e. antlers on the extinct Irish Elk)
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Moritz Lecture 7 Notes - 2 2. Intersexual competition is the case where males must show themselves to
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Moritz7Notes - Biology 1BEvolution Lecture 7 (March 10,...

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