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]
Which statement best i*b +9))ljnz/ixrj b mgllustrates the process o9b :n 7x hv7baoadx)2nf evolution?
A. A horse that increases its maximum running speed has faster offspring.
B. A random mutation gives resistance to a disease and spreads in the population.
C. Mutations occur as needed to increase fitness in individuals and populations.
D. The most complex organisms are the most evolved.
参考答案: B
本题详细解析:
Choice B is correct because evolution is the change in heritable characteristics of a population, and random mutations alter heritable traits. In this case the mutation confers resistance to a disease, making these individuals more likely to survive and pass on the mutation to their offspring. Over time resistance to the disease becomes more prevalent in the population. Choice A is incorrect because traits acquired through an organism's lifetime cannot be passed on to the next generation. Choice C is incorrect because mutations are random and do not occur because an individual or population requires a different trait. Choice D is incorrect because complexity is not a measure of evolutionary progress, as evolution refers to change over time.
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