A man whose father was color blind marries a woman who had a color-blind mother and normal father. What percentage of male children of this couple will be color blind?
Correct answer: C. 50%
- A. 25%
- B. 0%
- C. 50%
- D. 75%
Explanation
The woman (mother's mother color-blind is a carrier (XcX). Sons receive X from mom and Y from dad, so each son has 50% chance of inheriting the mutant X and being color-blind.
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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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