Question

The chromosomal number of the sexually producing parents and their offspring is the same. Justify this statement.....

Answer 1

All human beings have 23 pairs of chromosomes in the nuclei of their cells.There are two types of sex chromosomes
1- X chromosome
2- y chromosome
X X in females and XY in males
thus the offspring gets X chromosome from mother and X or Y chromosome from a father .
Hence, it is same.
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Answer 2

In an organism each trait is regulated by genes which are not present as a single long thread of DNA, but as separate independent pieces, each called a chromosome. Thus, each cell will have two copies of each chromosome, one each from the male and female parents. Every germ-cell will take one chromosome from each pair and these may be of either maternal or paternal origin. When two germ cells combine, they will restore the normal number of chromosomes in the progeny, ensuring the stability of the DNA of the species.
In other words ,Number of chromosomes is halved during gamete formation. As a result, the number of chromosomes in gamete is half the number of chromosomes in somatic cells. When male and female gametes fuse during fertilization, the number of chromosomes becomes equal to that in somatic cells. This is how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.