What percentage of Couple 1’s male offspring will be color blind? What percentage of their female offspring will be color blind?
Part A
Couple 1 comes into your office. The husband has normal vision; the wife is heterozygous for the color-blindness allele.
What percentage of Couple 1’s male offspring will be color blind? What percentage of their female offspring will be color blind?
ANSWER:
Part B
Couple 2 comes into your office. The husband is color blind; the wife is homozygous for the normal vision allele.
What percentage of Couple 2’s male and female offspring will be color blind?
ANSWER:
Part C
Couple 3 comes into your office. The husband is color blind; the wife is heterozygous for the color-blindness allele.
What percentage of Couple 3’s male and female offspring will be color blind?
ANSWER:
Part D
Review the results you obtained for the female offspring of the three couples.
Based on your results for the female offspring, predict whether color blindness is a dominant or recessive trait. Explain your reasoning.