All sons of an affected father will be affected in case of:
Correct answer: B. Y-linked traits
- A. X-linked recessive traits
- B. Y-linked traits
- C. X-linked dominant traits
- D. X-linked traits
Explanation
The correct answer is Y-linked traits. This is because Y-linked traits are located on the Y chromosome, which only males possess. Therefore, an affected father will pass the trait to all of his sons, as they inherit the Y chromosome from him. In contrast, X-linked traits, whether recessive or dominant, are located on the X chromosome. Fathers cannot pass X-linked traits to their sons, as they pass the Y chromosome instead. Thus, options A, C, and D are incorrect.
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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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