Question
The Smiths have four children, all girls. Their fifth child is a boy. Why did this change occur?
A) the father' contribution of a Y chromosome.
B) the conception classes taken by the parents.
C) the mother' contribution of a Y chromosome.
D) the timing of the fertility cycles.
A) the father' contribution of a Y chromosome.
B) the conception classes taken by the parents.
C) the mother' contribution of a Y chromosome.
D) the timing of the fertility cycles.