Most parents are heterozygotes with one normalallele and one mutated allele.
大多数父母是一个正常等位基因和一个突变等位基因的杂合子。
2
Because the normalallele (a) can completely cancel the mutant allele (a), animals with Aa or Aa look the same.
因为正常等位基因(A)可以完全取消突变等位基因(一),动物使用AA或AA看起来是一样的。
3
Haploinsufficiency --- A cause of genetic disease in which the contribution from a normalallele is insufficient to prevent disease because of a loss-of-function mutation at the other allele.