本题目来源于试卷: Unity and Diversity A.7 Classification and Cladistics，类别为 IB生物学
[单选题]
What is the relationship between the x56m,c5 gyjzx;j6bne pt s;; dnumber of dij 8 loyo (wpovvj1589zfferences in DNA base sequences and time since diverg8v pzyv8l(1 w 59jooojence from a common ancestor?
A. The lower the number of differences, the more recently organisms diverged from each other.
B. The number of differences is equal to the number of years since the organisms diverged.
C. The higher the number of differences, the more recently organisms diverged from each other.
D. There is no relationship between the number of differences in DNA base sequences and time since divergence.
参考答案: A
本题详细解析:
The number of sequence differences acts as a molecu1l.gxy(h4 r u 1*fmvbmlar clock, so the lower the number of differences accumulated in the DNA bas f yu mx.1r1*mvh4blg(e sequence, the more closely related and more recently the organisms diverged from each other. Choice A is correct. Choice B is incorrect because the number of differences is not an exact measurement of time. Choice C is incorrect as it’s the opposite of Choice A. Choice D is incorrect as there is a relationship.
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