!!!!1 how is the chromosome number kept constant from generation to generation? meritnation experts nd my dear frends pleez answer fast!!!!!

The chromosome number is kept constant from generation to generation because of process of mitosis and meiosis. While mitosis is equational division which ensures the chromosome number remains same in somatic cells, meiosis is reductional division which takes place in reproductive cells. The chromosome number is reduced to half in the gamete cells so that fertilization restores it back to the original number.