A father has 23 pairs of chromosomes and a mother has 23 pairs of chromosomes . Their offsprings are formed by the fusion of their respective gemetes. Then why don't their offspring has 46 pair of chromosomes?

Explanation

The gametes produced by the father and the mother do not have 23 pairs of chromosomes. Every germ cell will take one chromosome from each pair and hence will contain 23 chromosomes. When two germ cells combine, they will restore the normal number of chromosomes in the progeny (23 pairs).