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8 December, 21:41

Bob is heterozygous for a (dominant) widow's peak hairline and Loretta is homozygous recessive for a (recessive) straight hairline. What is the probability that their first child will have a widow's peak hairline?

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  1. 8 December, 22:09
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    The probability that their first child will have a widow's peak hairline is 100%. This is proven because in the punnet square in this situation, all outcomes turn out to be dominant for the widow's peak.
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