Question

Women have sex chromosomes of XX and men have sex chromosomes of XY. Which of a man's grand parents could not be the source of any of the genes on his Y-chromosome ?

• A. Father's mother
• B. Father's father
• C. Mother's mother
• D. Mother's mother, mother's father and father's mother

Answer 1

The correct option is D Mother's mother, mother's father and father's mother

The Y chromosome is inherited solely from father to son in each generation.

Thus, the correct answer is option D.