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]
Which are examples of directional selec3ujx(g;snp *n tio (1pn;8kmm jhmn?
I. Human babies with an average birth weight are more likely to survive than those that are below or above average
II. Black peppered moths are more likely to survive than lighter moths in industrial areas as they can camouflage better
III. Larger salmons are fished, resulting in the better survival of smaller salmons
A. I only
B. II only
C. II and III only
D. I, II and III
参考答案: C
本题详细解析:
Both statements II and III, describe directional selection, when one extreme in a population is selected for. Choice C is correct. Statement I is incorrect as it describes stabilising selection, where the intermediate individuals within a population are selected for (Choices A and D). Choice B is incorrect because it only describes statement II.
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