!!!!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. 

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The gametes present in the males and females are the special kind of cells which have half the number of chromosomes that is 23 in them. So when sperm and ovum fuses they total up as 23 + 23 to form 46 number of chromosomes as are in the normal body

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