How is the sex of the child determined in human beings ?

Explanation

Human beings have 22 pairs of autosomes and one pair of sex chromosome. This pair is XX in females and XY in males. Thus, if parents are

This cross shows that females produce all similar gametes, carrying X chromosome. While males produce two types of gametes 50% with X and 50% with Y chromosome. Hence, when a female gamete fuses with sperm with X chromosome, a female child is produced and when it fuses with sperm with Y chromosome, a male child is produced. So, it is male that determines the sex of the child.