How many pairs of chromosomes are present in the somatic cells? Are the last pair of chromosomes present in the reproductive cells only?
In human somatic cells, there are 23 pair (2n) of chromosomes, and there are 23 pairs in all cells except in gametes. Of the 23 pair in somatic cell, 22 pair are autosomes, while two are sex chromosomes.
In gamete 23 chromosomes are present (n).
There are male gametes called sperms and female gametes called ova.
50% sperms contain X chromosome and 22 autosomes; other 50% contain Y chromosome and 22 autosomes.
All ova contain one X chromosome and 22 autosomes.