Question

One method of determining sex-linked inheritance is

• A. Sons and daughters resemble mothers.
• B. Sons and daughters resemble fathers.
• C. Sons resemble mother and daughters their mother.
• D. Sons resemble father and daughters their mother.
• E. Sons resemble mother and daughters their father.

Answer 1

The correct option is E Sons resemble mother and daughters their father.

Since Y-chromosome carries a few genes, there are few Y-linked traits which are inherited from father to son. Most of the sex linked traits are X-linked. Sons receive their single copy of X-chromosome from mother and hence resemble mother. Daughters carry two X-chromosomes which they receive from both parents. As most of the sex linked traits are recessive and are expressed in homozygous conditions only, the genotype of father determines the phenotype of daughters. Option E is the correct answer.