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 thb,dn me 6yrf;5:e)qdg ,suj5r e qt r,a;5/nxmr mb9yixke235 i strongest evidence supporting the hypothesis that two populations are two different speciesyi;im r tn9,bx2ekx5a3/r5 qm ?
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 tgocb3e1tn 4f3 ei. 173 qojeqvwo reproductively isolated populations are a key component of the definition of a species.Choice A is incorrect because allele frequencies often differ between different populations of the same species. Choice C&qj1nobeg3 eto ec 34v3iq7f1.nbsp;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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