我们发现很多基因突变以后在实验室条件下没有可见的表型。

Many genes have been found that, when mutated, show no visible phenotypic effects under laboratory conditions.

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对达尔文来说，造成子代表型和父代表型存在差异的因素中，生物自身所起的唯一作用就是随机突变。

For Darwin, the only thing that organisms contribute to determining how next-generation phenotypes differ from parent-generation phenotypes is random variation.

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Veltman认为，致病突变的鉴定有可能让临床医生进行疾病的产前检测，同时为有着相似表型的其它疾病提供了线索。

Veltman said that identifying the causative mutation could potentially enable clinicians to do prenatal testing for the disorder and also could shed light on other diseases with similar phenotypes.

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