本题目来源于试卷: Continuity and Change D.10 Natural Selection，类别为 IB生物学
[单选题]
The peppered moth (Biston betu 7h-muug ;i:hqlari 69;yq q 7aq.7ff3oiab jkp4n ja) is often used as an example when discussing industrial mela yj f9aik naqpq;4o q3bf6.77 jnism.
Which of the following is responsible for the increase in the proportion of the melanic form during the industrial revolution?
I. Increased mutation rate
II. Natural selection
III. Sexual selection
A. I only
B. II only
C. I and II only
D. I, II and III
参考答案: B
本题详细解析:
Choice B is correct because only Statement II is correct. Natural selection is the process which led to the increase in the proportion of melanic moths. The melanic form had a selective advantage and thus more individuals survived to reproduce and pass on their mutation to their offspring. Choices A, C and D are incorrect because Statement I, increased mutation rate, is not responsible for the increase in the melanic form, because the mutation rate stays fairly constant. Statement III is also incorrect because sexual selection is related to mate choice, while industrial melanism is due to selective predation.
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