1.blubber is a thick layer of fat tissue found under the skin of all elephant se
ID: 26001 • Letter: 1
Question
1.blubber is a thick layer of fat tissue found under the skin of all elephant seals, conveying an advantage in making them tolerate cold water temperatures. this trait has a strong genetic basis, and all elephant seals have the genotype that produces blubber. is this trait currently undergoing selection?a. probably, because it confers an advantage
b. probably not, because it is now produced by the seals' environment rather than genes
c. probably not, because there is little genetic variation and so it can't respond to selection
d. definitely, because it is an adaptation
2. a population of butterflies on an island varies in wing size. some have large wings and some have small, but they still belong to the same species. all are doing well until a meteorite hits the island and kills many of the butterflies. more large- winged than small winged butterflies are killed. which of the following should we expect if we compare the next generation to the one that got hit?
a. directional selection has occurred
b. evolution has occurred
c. sexual dimorphism has occurred
d. none of the above should occur because this was a random stochastic event
Explanation / Answer
1.blubber is a thick layer of fat tissue found under the skin of all elephant seals, conveying an advantage in making them tolerate cold water temperatures. this trait has a strong genetic basis, and all elephant seals have the genotype that produces blubber. is this trait currently undergoing selection?
a. probably, because it confers an advantage
b. probably not, because it is now produced by the seals' environment rather than genes
c. probably not, because there is little genetic variation and so it can't respond to selection
d. definitely, because it is an adaptation
2. a population of butterflies on an island varies in wing size. some have large wings and some have small, but they still belong to the same species. all are doing well until a meteorite hits the island and kills many of the butterflies. more large- winged than small winged butterflies are killed. which of the following should we expect if we compare the next generation to the one that got hit?
a. directional selection has occurred
b. evolution has occurred
c. sexual dimorphism has occurred
d. none of the above should occur because this was a random stochastic event
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