The sex of the new born child is a matter of chance and neither of the parents may be considered responsible for it.What would be the possible fusion of gametes to determine the sex of the child?

Explanation

Out of 23 pairs of chromosomes, 22 pairs are autosomes and one pair (`23^(rd)` pair) is the sex chromosome. The female gametes or the eggs formed are similar in their chromosome type [22x+XX]. So human females are homogametic. The male gametes or sperms produced are of two types. They are produced in equal proportions. The sperm bearing [22+X] chromosomes and the sperm bearing (22+Y) chromosomes. So human males are called heterogametic.
It is a chance, as to which category of sperm fuses with the egg. If the egg [X] is fused by the X-bearing sperm an [XX] individual (female) is produced. If the egg [X] is fused by the Y-bearing sperm an [XY] individual (male) is produced. The sperm produced by the father, determines the sex of the child. The mother is not responsible in determining the sex of the child.