Which statement is true about lethal genes?
Responses

They cannot be maintained in a gene pool because they are always dominant.
They cannot be maintained in a gene pool because they are always dominant.

They can be maintained in a gene pool by heterozygous carriers when the allele is recessive and the individuals reproduce.
They can be maintained in a gene pool by heterozygous carriers when the allele is recessive and the individuals reproduce.

They can be maintained in a gene pool if the allele is expressed before reproductive age.
They can be maintained in a gene pool if the allele is expressed before reproductive age.

They cannot be maintained in a gene pool because the individuals do not survive.