本题目来源于试卷: Unity and Diversity A.8 Evolution and Speciation，类别为 IB生物学
[单选题]
Which of the following is the stu h45ld/qq-vsq:a n)lron su 6-jhyk98yetu2 ;z7ln poc.gest evidence supporting the hypothesis that two population9 u2u.h6 8c-yjzsy7loek;t p ns are two different species?
A. Allele frequencies differ between the two populations.
B. The two populations are reproductively isolated.
C. The DNA sequence of some genes was found to be different.
D. The two populations are geographically isolated.
参考答案: B
本题详细解析:
Choice B is correct because two reproductively isolated ac6, 7jddfn4jpopulations are a key component of the definition of a species.Choice A is incorrect because allele frequencies c4 fjjn 7a,6ddoften differ between different populations of the same species. Choice C is incorrect because varying DNA sequences in genes confirms the existence of different alleles, not the existence of two species. Choice D is incorrect because even when two populations are geographically isolated, they may still be the same species.
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