Which is true for an X-linked dominant trait?
Correct answer: A. All female offspring of the affected father will be affected.
- A. All female offspring of the affected father will be affected.
- B. Half of the female offspring of the affected father will be affected.
- C. No male offspring of an affected mother will be affected.
- D. No female offspring of the affected father will be affected.
Explanation
In X-linked dominant inheritance, an affected father will pass the trait to all his daughters (since he contributes his affected X chromosome to them) but none of his sons, as they inherit his Y chromosome.
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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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