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 is most likely a correct description o7p10 iu hzb+1cdo stv:w4d/z 4oq *ruz*8vu7sc h ia8of a given speciation event?
A. Bonobos and chimpanzees evolved from a common ancestor.
B. A hybrid species was produced by two smartweed species (genus Persicaria).
C. Reproductive isolation occurs between two species due to geographic isolation.
D. Bonobos and chimpanzees evolved from a common ancestor.
参考答案: B
本题详细解析:
Choice B is correct because speciation through polyploidy is common in smartweed; it sometimes involves a doubling of the chromosome number and often occurs in the same geographic location, so is an example of sympatric speciation. Choice A is incorrect because there was no doubling of the chromosome number in the speciation event that produced bonobos and chimpanzees. Choice C is incorrect because sympatric speciation is, by definition, speciation that occurs in the same geographic location, whereas allopatric speciation occurs in different geographic locations and does not generally involve the doubling of DNA. Choice D is incorrect because chimpanzees and bonobos are thought to have evolved through allopatric speciation, not sympatric speciation.
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