What is the risk of a color-blind child in a family when the mother is color-blind but the father is normal?
Correct answer: C. 50%
- A. 0 %
- B. 25%
- C. 50%
- D. 100%
Explanation
Since the mother is color blind and has a genotype of XcXc, the father is normal having genotype XCY. All the daughters will be carriers of the disease and all the sons since got their X gene from the mother will have a disease so the ratio will be 50%
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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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