Bio171-F11-Lec 24(1)

Bio171-F11-Lec 24(1) - Biology 171 Wednesday, November 3,...

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Biology 171 Wednesday, November 3, 2012 Lecture 24: Evolutionary Processes II Announcements Text Reading Lecture 24: 4 th : Chapter 25 (452-455) Lecture 25: 4 th : Chapter 15 (279-287), Chapter 25 (448-450) Sexual Selection Bateman-Trivers Principle Intersexual selection Intrasexual selection This Week in Discussion: Population Genetics/ Evolution Simulations Exam 2 MC average = 80%
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Sexual Selection Mate choice often plays an important role in evolution. Sexual selection is selection for enhanced ability to attract mates and is a form of natural selection. It is directed by female choice or male-male competition and results in traits that lead to greater mating success.
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Generally speaking, males compete more intensely for mates than do females, and females are choosier about their mates than are males. Why? Answer: Anisogamy Anisogamy is defined by the occurrence of gametes of different sizes. Males make many, many small gametes, called sperm . Females make fewer, large gametes, called eggs . Eggs are expensive whereas sperm are “ cheap ”.
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Bateman & Trivers’ principle : Difference in gametic investment between males and females leads to THREE PREDICTIONS .
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Bio171-F11-Lec 24(1) - Biology 171 Wednesday, November 3,...

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