A Child Is Born with a Lethal Dominant Allele

question 41

Multiple Choice

A child is born with a lethal dominant allele. This would seem to be impossible since either parent, had they possessed this allele, would have suffered its lethal effects. What is a possible explanation?

• A) The child's allele is a spontaneous mutation that neither parent had to deal with.
• B) The allele could have varying expressivity and not always be lethal.
• C) The allele could have delayed onset.
• D) All of these are possible.
• E) None of these is possible.

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