State the importance of chromosomal difference between sperms and eggs of humans.

Explanation

A male has one X chromosome and one Y chromosome. Thus half the sperms will have X chromosomes and the other half will have Y chromosome.
A female has two X chromosomes. So all the female gametes will have only X chromosomes If a sperm carrying X chromosome fertilizes an ovum then the child born will be a girl. If a sperm carrying Y chromosome fertilizes an ovum then the child born will be a boy.
Thus the chromosomal difference between sperms and eggs of humans determines the sex of the child.