Which of the following statements about sex determination is correct? At fertility

A. the probability of male to female offspring is 1/2
B. the Y chromosome of the father decreases the probability of having a male child to 3/4
C. the xx chromosome of the mother decreases the probability of having a female child to 3/4
D. the vigour of either parents determines the sex of the offspring

Correct Answer:

Option A – the probability of male to female offspring is 1/2