例如，因为突变的基因可以提高铁的吸收效率，所以遗传性血色素沉着病突变可以保护带菌者不缺铁。
For example, the hereditary hemochromatosis mutation protects carriers from iron-deficiency because the mutated gene allows increased efficiency of iron absorption.
广义上讲，性状遗传性衡量的是群体成员间的差异在多大程度上可以用基因差异解释。
In broad terms, the heritability of a trait measures the extent to which differences among members of a population can be explained by differences in their genetics.
人们越来越清楚的认识到，性格和才智，至少部分是具有遗传性的。 所以假设乐观与悲观的倾向在某种程度上通过基因传递着。
That personality, along with intelligence, is at least partly heritable is becoming increasingly clear; so, presumably, the tendency to be happy or miserable is, to some extent, passed on through DNA.
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