Some genetic characteristics can be expressed only during specific periods in the life of an organism. If an organism dies before the characteristic is expressed, it never has the opportunity to contribute to the overall fitness of the organism. Say, for example, a tree has genes for producing very attractive fruit. The attractive fruit is important because animals select the fruit for food and distribute the seeds as they travel. (A) , if the tree dies before it can reproduce, the characteristic may never be expressed. By contrast, genes such as those that contribute to heart disease or cancer usually have their effect late in a person’s life. Because they were not expressed during the person’s reproductive years, they were not selected against, because the person reproduced before the effects of the gene were apparent. (B) , such genes are less likely to be selected against than are those that express themselves early in life.


여기서 they는 암을 유발하는 것처럼 늦게 발현되는 유전자들은 맞는 거 같은데 " 그 유전자의 특성이 명백해지기 전에 사람이 번식을 하기때문에 그 유전자들은 도태되지 않는다"라는 부분이 이해가 안됩니다. 직역은 되도  사람의 번식과 유전자의 도태가 무슨 관계인지 이해가 명확하지 않네요.


듀게에 왜 영어 독해까지 질문을 드리나 싶으시겠지만 도움 부탁드려요;;

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