Question

Consider the following statements:
Assertion (A): In human beings, Y-linked genes of non-homologous part are called holandric genes
Reason (R): Y-chromosome is present in males only

• A. Both (A) and (R) are true, (R) is the correct explanation of (A)
• B. Both (A) and (R) are true, (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

Holandric genes → only in males, non-homologous Y; X-linked → mostly expressed in males due to hemizygosity. Track inheritance patterns in pedigrees.

Answer 1

The Correct Option is A

Holandric genes are located on the non-homologous region of Y chromosome, transmitted strictly from father to son. Y-chromosome is male-specific, explaining the male-limited inheritance pattern.