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]
In the Indian ocean, sd8 4 asarm2;j/zm tlb.and coloured oysters blend rrc 767 py.of6p8jgdxpr :gu)into rocks in the sand bar and dark coloured oysters blend better into the deepest partfjug7d6)rg:pc8. po pyr 76x rs of the ocean. What type of selection is this an example of?
A. Directional selection
B. Stabilising selection
C. Disruptive selection
D. Artificial selection
参考答案: C
本题详细解析:
It is disruptive selection, as any intermediate varieties of oysters have been selected against. Choice C is correct. Choice A is incorrect as directional selection would mean that the population moves towards one extreme, i.e. either dark or light coloured oysters. Choice B is incorrect as stabilising selection promotes intermediate varieties and gets rid of extreme varieties. Choice D is incorrect as artificial selection is controlled by humans.
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