a child is born with a lethal dominant allele. this would seem to be impossible

Question

a child is born with a lethal dominant allele. this would seem to be impossible since either parent, had they possesed this allele, would have suffered its lethel effects. what is a possible explaination? a. this child's allele is a spontaneous mutation which neither parent had to deal with. b. the allele could have delayed onset in both parents. c. the allele could have delayed onset in one parent. D. all of these are possilble. E. none of these is possible.

im connfuse with thies question i need explaination why?

Explanation / Answer

D. all of these are possible

This child's allele ia a spontaneous mutation which neither parent had to deal with

The allele could have delayed onset in both parents

The allele could have delayed onset in one parent.

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