Hemophilia A and B always pass from:
Correct answer: B. Maternal grandfather to grandson
- A. Father to son
- B. Maternal grandfather to grandson
- C. Father to daughter
- D. Paternal grandfather to grandson
Explanation
Hemophilia A and B are X linked recessive traits and their genes are located on X-chromosome. For a son X-chromosome is always contributed by mother.
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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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