Question

There is an autosomal gene responsible for the formation of a so-called widow’s peak in human hairlines. The allele that causes the peak is dominant. Twenty-five percent of people do not have a peak (peakless). A man with a peak whose mother was peakless marries a woman with a peak. Her peak “ancestry” is unknown. The alleles are in Hardy-Weinberg equilibrium. What is the probability that the couple’s first child will have a peak?

• A. Can’t be determined
• B. 0.83
• C. 0.87
• D. None of the other answers is correct.
• E. 0.56
• F. 0.50

Answer 1

Answer is D.

Please look in image.