Help!! ASAP I RLLY NEED HELP in which situation might a gene pool contain an allele that causes a lethal disease?
A. If the allele is on the Y chromosome
B. If the allele is expressed after reproduction has occurred
C. If the allele is in the mitochondria
D. If the allele is expressed in its dominant form

D. If the allele is expressed in its dominant form

Explanation:

The allele that causes a lethal disease is called lethal alleles.  

Lethal allele can be recessive and dominant but the recssive allele should be present on both the chromosome and not only one.

If the allele is expressed in its dominant form, than it can cause lethal disease. Only one copy of this dominant lethal allele can cause death of the person. For example: Huntington's disease.

Hence, the correct option is "D".

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tobey