Males who inherit the mutant gene die before birth.

继承突变基因的雄性在出生前就会死亡。

But the mutant gene doesn't cause the animals to eat less.

但这种变异基因不会让动物的食量变小。

Fortunately for the females, the specifics of how the mutant gene is inherited make it impossible for them to inherit two copies.

幸运的是，对于雌性来说，突变基因遗传的具体方式使她们不可能继承两个副本。