本题目来源于试卷: Unity and Diversity A.6 Diversity of Organisms，类别为 IB生物学
[单选题]
Which of the following would :m-no p,-c rx/lhi9wyprovide evidence for t*iexdxz, *;w8irf pm)wo individuals belonging to different speciesdemp, r)**8;xx iwifz?
I. Differences in genome base sequence
II. Differences in genome size
III. Differences in chromosome number
A. III only
B. I and II only
C. II and III only
D. I, II and III
参考答案: A
本题详细解析:
Choice A is correct because only domm)4lx 3 az-aj6)htstatement III is evidence of organisms being different species. Organisms of the same species will normally have the x ja ht zo6-mdl)34m)asame number of chromosomes, except in the case of some genetic conditions such as Down syndrome in humans. So organisms having different numbers of chromosomes is evidence for them being separate species. Statements I and II can both vary within a species due to mutations.
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