A normal woman, whose father was colour blind, marries a colour-blind man. The ratio of their children for colour blindness can be:
Correct answer: A. 50%
- A. 50%
- B. 25%
- C. 100%
- D. 75%
Explanation
If a normal-visioned woman had a color-blind father, the woman will be a carrier (XXc). When a carrier woman marries a color-blind man (XY), their offspring will include a carrier daughter, color-blind daughter, normal son, and color-blind son (Table 1). Hence, the fourth son may be color blind or have normal vision.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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