The Inheritance of Color Blindness Worksheet
BIO 240 The Inheritance of Color Blindness Worksheet
The Inheritance of Color Blindness Worksheet:
a) What percentage of Couple 1’s male offspring will be color blind? What percentage of their female offspring will be color blind?
- Couple 2 comes into your office. The husband is color blind; the wife is homozygous for the normal vision allele.
- Couple 3 comes into your office. The husband is color blind; the wife is heterozygous for the color-blindness allele.
- 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.
The Inheritance of Color Blindness Worksheet
b) Complete the Punnett squares below to determine the possible genotypes of each couple’s male and female offspring. (X^{it N} represents the normal color vision allele. X^{it n} represents the color-blindness allele. Y represents the Y chromosome, which does not carry the color-vision gene.)
- Review the results you obtained from the lab for the female offspring of all three couples. Then, look at the female offspring (the offspring with two X chromosomes) in your three Punnett squares.
- What genotype must a female child have in order to be color blind?
- Explain why color blindness occurs more commonly in males than females.
- Based on your Punnett squares, determine whether a son can inherit color blindness from his father. Explain your reasoning.
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