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 betwecdsgt 92 a g: v+0wtcgu(*cqh9en the number of differe6n5uqw4r) *9pyd4 ybi)ziw wik;op1fnces in DNA base sequences and time since divergfrqy6wbk4y4w o)u5iw1p)d 9i n*pi;zence 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 molecul3dcgikwrnl7 mn3d3is 4q1pbxh.l3n4 sj 0t/2 ar clock, so the lower the number of differences accumulated in the DNA base sequence, the more closely related and more recently the organisms diverged from each other. Choice A is correct. Choic4ci l3p.l4w/ki3ds m 3gjq0 bx2snd37hrn1nte 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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