Chapter 10: Sexual Selection

1.	The “puzzle of sexual dimorphism” refers to the fact that [Hint]
2.	According to sexual selection theory, differences in reproductive investment lead to differences in factors that limit lifetime reproductive success. Based on the graph, of this species have the highest reproductive investment [Hint]
3.	List and briefly describe the two general forms of sexual selection. [Hint] To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
4.	Why did Wikelski et al. infer that body size in male Galapagos marine iguanas was sexually selected? Use the graph to help identify the correct answer. In each histogram, asterisks mark the largest size at which individuals could maintain body weight in two different years. [Hint]
5.	In their study of sexual selection in Galapagos marine iguanas, Wikelski et al. were able to demonstrate that [Hint]
6.	List and briefly describe three different traits that might be selectively favored in males facing sperm competition. [Hint] To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
7.	In African lions, infanticide seems to be adaptive for males because of the combination of _____ and _____. [Hint]
8.	Moller's study of experimentally manipulated barn swallows revealed that males with the longest tail feathers [Hint]
9.	Generalizing from the example of female choice for genetic quality in grey tree frogs, "good genes" models of sexual selection via female choice should include which of the following? [Hint]
10.	The chief prediction of the sensory exploitation hypothesis for female choice is that [Hint]
11.	For runaway selection to reinforce essentially arbitrary female preferences for male traits, which of the following must be true? [Hint]
12.	Male Syngnathus typhle (a species of pipefish) prefer females with fewer of the spots caused by parasites (even when those spots are actually tattoos). Based on the information presented in the text, which is the most likely model for this pattern of choosiness -- good genes, direct benefits, or sensory exploitation? Briefly defend your answer. [Hint] To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
13.	Evidence that sexual selection explains some examples of sexual dimorphism in flowers through selection on male function (pollen donation) includes which of the following? [Hint]
14.	Briefly explain two reasons why studying the evolutionary significance of behavior in humans is difficult. [Hint] To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
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