PT141.S2.Q22 > Question

SECTION 1 · rc

PASSAGE 1

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PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15

PASSAGE 3

Question 16 Question 17 Question 18 Question 19 Question 20 Question 21

PASSAGE 4

Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 2 · lr

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22 Question 23 Question 24 Question 25

SECTION 3 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14

PASSAGE 3

Question 15 Question 16 Question 17 Question 18 Question 19 Question 20

PASSAGE 4

Question 21 Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 4 · lr

The author hypothesizes that each of the two distinct populations of sockeye salmon has adapated genetically to their distinct habitats. This is the author’s causal explanation for the fact that the two distinct populations are different genetically, even though they both began as part of the same group of genetically uniform sockeyes.

The author assumes there’s no other explanation for why the two groups of salmon are genetically distinct besides adaptation to their environments. This overlooks the possibility that the two populations are genetically different due to interbreeding with various other fish groups.

This helps eliminate the alternate explanation of interbreeding. In theory, the two populations might have been genetically different because one of them bred with the native salmon. (A) eliminates that explanation.

This tells us the native salmon used to be two distinct populations. But that doesn’t shed light on the origin of the genetic differences between the sockeye salmon, which are different from the native salmon.

Where salmon typically spend time has no impact, because we know the two populations don’t interbreed and live in different areas of the lake.

This tells us that one of the two sockeye populations is similar to the original sockeyes. But this doesn’t help establish the cause of the genetic differences between the two current sockeye populations.

The overall number of salmon has no clear impact on the explanation for the genetic differences between the two populations.

PrepTest 141 - Section 2 - Question 22

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