That day I was thinking that hey,why do we need all the genes & all the 22 pairs(excluding the 2 X- or Y-chromosomes) of autosomes in every somatic cell, when each & every cell which is specialised for it's function does not manifest all the phenotypes that must be manifested by  the genes present .Aren't the  genes other than those whose phenotypes(& hence some chromosomes) are manifested by that cell redundant?