As Charles Darwin observed, natural selection operates whenever individuals of one genetic composition are better at reproducing than that of others.

正如查尔斯·达尔文（Charles Darwin）所观察到的那样，只要有一种基因组成的个体比其他个体更善于繁殖，自然选择就会起作用。

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A clone refers to one or more offspring derived from a single ancestor, whose genetic composition is identical to that of the ancestor.

克隆是指来自同一祖先的一个或多个后代，其基因构成与其祖先完全相同。

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Genetic drift is change in the genetic composition of a population arising as a consequence of sampling of gametes in a finite population.

所谓遗传漂变就是指：在一个有限的种群内，由于配子的随机取样使得遗传组成在种群内发生变化的现象。

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"Their assessments of healthiness and attractiveness were related to the genetic composition of these men, " Professor Gosling told BBC News Online.

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This is either because they cause no change in the composition of the protein that the gene encodes (some apparently different genetic words actually have the same meaning to the protein-making apparatus), or because the change they make has no effect on the protein's function.

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