Which one of the traits zigzags from maternal grandfather through a carrier daughter to a grandson?
Correct answer: B. X-linked recessive
- A. Autosomal
- B. X-linked recessive
- C. Y-linked dominant
- D. X-linked dominant
Explanation
The correct option is B) X-linked recessive. In this case, the grandson would inherit the trait from his carrier mother who received the affected X chromosome from her grandfather.
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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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