What is the risk of a color-blind child in a family when the father is color-blind but the mother is normal?
Correct answer: A. 0%
- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation
Since the gene of color-blindness is recessive the father genotype will be XcY and the mother is normal so her genotype will be XCXC. when both are crossed XcY x XCXC the result will be 1. XcXC 2. XcXC 3. XCY 4. XCY. So there chance of a color-blind child will be zero.
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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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