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 provide evidence for tl :7up kdr8q-(bhf px:wo individualsod5u1 nqhh8ye wzp 46o)z6xl; belonging to diff1w8dpzl ho n z65xu6e;yh)q o4erent species?
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/n sssvszxei i sy0s,-y2.-1z only statement III is evidence of organisms being different species. Organisms of the same species will normally have the same number of chromosomes, except in the case of some genetic conditions such as Down syndrome in humans. So oei0 2izy.nzs sv,s1x-ss sy/- rganisms 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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