What are the chances of a hemophilic son, whose mother is a carrier but whose father is normal?
Correct answer: D. 50%
- A. 0%
- B. 75%
- C. 25%
- D. 50%
Explanation
The father always passes on his Y chromosome since he does not have the hemophilia gene. Thus, the chance of having a hemophilic son is 50%, and the correct option is D) 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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