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 stronr;65wbob5 tgkp 5djv-gest evidex bjv7+svk5 e9sy*v+ykl 4)k1pp5*a c/xnur ence supporting the hypothesis that tba 4u p++p *51/e kvk5) sv7js kexrcx*lyyv9nwo populations 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 populati qudjijw5xgwu( l79r 25 f6oc*ons are a key component of the definition of a species.Ch9xidw(5f wurgq*c6o 75lj2 ujoice A is incorrect because allele frequencies often 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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