Unity and Diversity A.8 Evolution and Speciation (id: cf358d1c9)

本题目来源于试卷: Unity and Diversity A.8 Evolution and Speciation，类别为 IB生物学

[单选题]
Shown in diagrams A and B2l;qdfg-ns7.wm 5h *1x jr,60y e3jbcpua opf ar.gl .pg9 -g)g dhgzb1oe two pairs of similar structures.

Which of the following statements correctly explain the structural similarities shown in diagrams A and B?
I. Structural similarities in diagram A are primarily due to random mutations, not common ancestry.
II. Structural similarities in diagram B are due to the fact that they both perform similar functions.
III. Diagram A depicts analogous structures, and diagram B depicts homologous structures.

A. II and III only
B. I and II only
C. II only
D. I, II and III


参考答案:  C


本题详细解析:

Choice C is correct because only statement II correctly explains the structural similarities.

The bird and insect wings are similar due to convergent evolution. Statement III is incorrect because diagram A depicts homologous structures, and diagram B depicts analogous structures. Statement I is incorrect because humans and bats evolved from a common ancestor, and random mutations slowly gave rise to differences in the pentadactyl limb between different species. Choices A, B and D are all incorrect because they include either statements I or III, or both.

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