All the characteristics of the body which are inherited from parent’s weather it is blue eyes of mother or dark complexion from the father. Characteristics are passed on by genes and carried on your chromosomes. The basic laws of heredity were discovered by an Austrian Gregor Mendel. Our body characteristics are the combination of two sets of instructions , one from mother’s chromosomes and the other from the father’s so it is the work of only one gene, that is called to be “Expressed” it is dominant gene while the other one is dormant. Dormant or asleep gene may be pass on to next generation.