Question

Sex of a child is determined by the father. How?​

Answer 1

Answer:

As father's sperm is having X Y chromoses and mother's ovum is having X X chromoses. So when Father X chromoses fertilise Y chromoses of mother then there is chance to have a son and when the X chromoses of father fertilise X chromoses of mother then there is chance to have a daughter.

In other words you can say

In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.