Question

Who is responsible for the sex of the unborn child: father or mother? Why?

Answer 1

• The sex of the unborn child is determined by the male parent.
  
• Females have the $XX$ chromosomes, while males have the $XY$ chromosomes.
  
• When a female's $X$ chromosome combines with a male's $X$ chromosome, a girl is born, and when a female's $X$ chromosome combines with a male's $Y$ chromosome, a boy is born.
  
• As a result, the sex chromosome of men (father) decides the child's sex.