Only an animal with two mutant alleles will be an albino.
只有一两个基因突变的动物将是一个患白化病。
CYP2C9 gene has several mutant alleles leading to genetic polymorphisms in humans.
CYP2C9基因具有遗传多态性，在人类存在几种等位基因的突变体。
Single-gene disorder --- A disorder due to one or a pair of mutant alleles at a single locus.
由单个基因发生突变引起的遗传病。
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