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]
Two species of smartweed (genus Persicaria) hybridiszmu b53oegbwjt5+oa 9x c4: (se prd3zvw xxx 9d5b/e46and form a new species. If both ofz 5x e69pdbwrx/vxd43 the parent species have two copies of each chromosome, how many copies of each chromosome is a daughter species most likely to have?
A. 2n only
B. 2n or 4n
C. 4n only
D. $n$ only
参考答案: B
本题详细解析:
Choice B is correct because if each parent is 2n, both parents could occasionally produce 2n gametes, resulting in a 4n daughter species. Both parents could also produce haploid gametes (n), resulting in a 2n daughter species. Choice A and C do not include both 2n and 4n, so they are incorrect. Choice D is incorrect because each parent typically passes on at least one complete set of chromosomes, so the minimum number of chromosome copies would be 2n in the daughter species.
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