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questions_week-4_13

Again consider the example of coevolution between the

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19) Again consider the example of coevolution between the Yucca moth and the Yucca plant. Under which conditions (number of flowers per plant) would the mutualism between the plant and moth be least stable? a) one flower/plant; b) two flowers/plant; c) 5 flowers/plant; d) tens of flowers/plant; e) hundreds of flowers/plant.
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20) Suppose that you measured the level of polyspermy that occurred in two isolated populations of fruit flies: populations-A and population-B. . In year-1 polyspermy was 2% in population-A and 0% in population-B, but ten years later polyspermy was 0% in both populations. Which hypothesis would predict this result? Intraspecific/intergenic mutualistic coevolution; In wolf spiders, some species have males with “tufts” on their forelegs that they wave at females during courtship. In other species of wolf spiders the males do not have tufts (tuftless). A recent experiment used video tapes of courting males that were presented to receptive females via a TV-like display. Females that were viewing displaying males on the TV screen indicated that they wanted to mate with a “digital male” by positioning their bodies into a mating posture. With digital technology, male tufts could be added to males from male-tuftless species and tufts could be removed from male-tufted species. The researchers found that females from both male-tufted and male-tuftless species preferred to mate with tufted males. However, they also found that females from male-tufted species had weaker preference for male tufts compared to females from male- tuftless species. Note: In the figure, “M” stands for male and “F” stands for female. 21) Which mapping of traits best describes the experimental data. 22 ) Which model of sexual selection best fits the observed data:
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23) If reduced female preference for tufted-males was not observed in the male-tufted species, then the data would best support which model of sexual selection? a) Sensory exploitation d) Good-genes b) Sexy sons e) Intersexual conflict c) Material benefits 24 ) If the tufts were not found to be attractive to females but instead they were effective as a visual signal to
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