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Study_Guide_2 - Bio 54 Study guide for exam 2 Fall 2004 1....

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Bio 54 – Study guide for exam 2 Fall 2004 1. In seahorses, males brood their young in a brood patch. In this system, reproductive success of males is limited to the number of young they can successfully provision in their brood pouch. Reproductive success of females is limited to the number of eggs she can produce. Studying a particular species of seahorse, you find that males can brood 100-200 eggs in a season, but that females can produce 400-600 eggs in a season. a. Which sex do you expect to be the choosy sex? Why? b. What benefits might the choosy sex gain by being choosy? 2. Explain how a 50:50 sex ratio is maintained by frequency dependent selection in species like humans. (Hint: Does each sex have an advantage or a disadvantage when rare? Why?) 3. How can the asymmetry between the sexes explain why many fish begin their lives as females, but change sex once they reach a certain size? 4.
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Study_Guide_2 - Bio 54 Study guide for exam 2 Fall 2004 1....

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