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 evidenceir3t1/ 9tihf c fv p0dey(z 1qq-or two individuals belonging to different speciey-(1qz 0qdp evs?
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 statement III j lzkoue l a5j).h(dnx8ya 51qqkp1) 1is 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 organisms having different numbers of chromosomes is evidence for them being separate species. Statements I and II can both vary within a speckxkeqly8d1) ljhqpan1 )z (a 1uj.o55 ies due to mutations.
| 
