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题目材料：

Founder mutations are a class of disease-causing genetic mutations, each derived from its own ancestral "founder" in whom the mutation originated. While most disease-causing mutations are found in humans at a rate of one in a few thousand to one in a few million people, founder mutation can occur at much higher rates. This apparent anomaly is partially explained by the fact that most founder mutations are recessive: only a person with copies of the affected gene from both parents becomes ill. Most people with only one copy of the gene-"carriers"-survive and pass the gene to offspring. Furthermore, the single copy of a founder mutation often confers a survival advantage on carriers. For example, the hereditary hemochromatosis mutation protects carriers from iron-deficiency anemia because the mutated gene allows increased efficiency of iron absorption.

The author of the passage mentions the "hereditary hemochromatosis mutation" primarily in order to illustrate

Athe circumstances under which a founder mutation fails to cause a disease.
Bhow difficult it is to predict the effects of founder mutations on carriers.
Cthe difference between harmful founder mutation and those that are beneficial.
Dhow a single copy of a founder mutation can benefit a carrier.
Ea challenge to a particular theory about the transmission of founder mutations.

D显示答案

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以上解析由考满分老师提供。

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