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questions_week-4_13

The intra specific red queen hypothesis predicts that

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39) The intra-specific Red-Queen hypothesis predicts that, over long periods of time: a) Gazelles and Cheetahs will evolve to run at faster speeds b) Cheetahs will continually gain an advantage over gazelles c) Yucca moths will evolve to become less harmful pollinators d) Coevolution between species that are mutualistic (like yucca and yucca-moth)is slower than between species in conflict (like cheetah and gazelle) e) Genes that interact in a mutualistic way (like those coding for insulin and its receptor) evolve slower than genes that interact in an antagonistic way (like those coding for lysin and the egg- coat protein matrix). 40) Consider coevolution between the lysin gene and the gene coding for the egg-coat protein matrix and assume that the intraspecific Red-Queen hypothesis is correct. If the egg-coat protein matrix gene was stopped from evolving then: 41) A new mutation decreases the survival to adulthood of males of an annual species of fish by 50% but simultaneously doubles mating success (fecundity). This allele is expected to a) increase by the combination of survival and sexual selection b) decrease by the combination of survival and sexual selection c) be selectively neutral (no change in fitness) d) be favored by sexual selection e) answers a & d are both correct
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Use the information below for the next four questions (until you see a bar beneath the question) An evolutionary biologist observes that the brightness of coloration of the head of yellow-headed blackbirds is variable within populations. Only males have yellow heads. The major predators on these birds are bird-eating snakes and foxes. She carries out two experiments. In EXPERIMENT-1, she brightens the heads of some males, dulls the heads of others, and in the third group (the CONTROL) she handles the birds in the same way but does not change the level of yellow coloration on the birds' heads. In EXPERIMENT-2 she traps and removes as many bird-easting snakes as she can at one location ( SNAKE-REMOVAL TREATMENT ) and at a second location (the CONTROL-2) she traps and then releases the bird-eating snakes back to their original locations (so there was no net change in the numbers of snakes). These treatments were continued for ten years. You can assume that the CONTROL-2 and snake-removal areas were identical in every other way except the density of snakes.
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