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nightblade354
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16 Jun 2021, 12:38
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Because the native salmon in Lake Clearwater had nearly disappeared, sockeye salmon were introduced in 1940. After being introduced, this genetically uniform group of sockeyes split into two distinct populations that do not interbreed, one inhabiting deep areas of the lake and the other inhabiting shallow areas. Since the two populations now different genetically, some researchers hypothesize that each has adapted genetically to its distinct habitat.
Which of the following, if true, most strongly supports the researchers' hypothesis?
(A) Neither of the two populations of sockeyes has interbred with the native salmon
(B) When the native salmon in Lake Clearwater were numerous, they comprised two distinct populations that did not interbreed
(C) Most types of salmon that inhabit lakes spend part of the time in shallow water and part in deeper water
(D) One of the populations of sockeyes is virtually identical genetically to the sockeyes originally introduced in 1940
(E) The total number of sockeye salmon in the lake is not as large as the number of native salmon had been many years ago
Which of the following, if true, most strongly supports the researchers' hypothesis?
(A) Neither of the two populations of sockeyes has interbred with the native salmon
(B) When the native salmon in Lake Clearwater were numerous, they comprised two distinct populations that did not interbreed
(C) Most types of salmon that inhabit lakes spend part of the time in shallow water and part in deeper water
(D) One of the populations of sockeyes is virtually identical genetically to the sockeyes originally introduced in 1940
(E) The total number of sockeye salmon in the lake is not as large as the number of native salmon had been many years ago
23 Jun 2021, 13:21
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A for me.
If one of the newer generation of salmon interbred with the ancient ones, that would be one reason for being "genetically different" from the other group.
So we need to assume A to ensure that "being genetically different" is not because of the above reason, and thus strengthens the facts that genetic difference could be because of habitat.
If one of the newer generation of salmon interbred with the ancient ones, that would be one reason for being "genetically different" from the other group.
So we need to assume A to ensure that "being genetically different" is not because of the above reason, and thus strengthens the facts that genetic difference could be because of habitat.
23 Jun 2021, 22:56
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Basically, if both the populations of the sockeye salmon interbred with the native ones, there would be some genetic similarity and we need to avoid that, right?
