A colour blind man marries a woman with normal vision whose father was colour blind. What proportion of their daughters will be colour blind?
Correct answer: B. Half
- A. None
- B. Half
- C. A quarter
- D. All of them
Explanation
The woman must be a carrier since she inherited her affected father's X. The colour blind father passes his affected X to every daughter, and the mother passes her affected X to half of them, so half the daughters are colour blind and half carriers.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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