Problem:

In humans, women have XX sex chromosomes and men have XY sex chromosomes. For this question, ignore the possibility of crossing over or random mutations.

For the following two questions identify grandparents as either

-their father's mother

-their father's father

-their mother's mother

-their mother's father

Question 1: Which of the grandparents of a woman could provide the genes on either of her X chromosomes? Explain thoroughly.

Question 2: Which of the grandparents of a man could provide the genes on his Y chromosomes? Explain thoroughly.