Genes

Genes Genes are present on chromosomes. The Genes are the "Mendelian factors" present in pairs (one received from the father, other from the mother), on the chromosomes. Thus, one member of a pair of genes present on the chromosomes has its pair on the homologous chromosome at the same location.

Genes are the bearers of hereditary characters or the units of heredity. A chromosome contains one molecule of the chemical called DNA. Genes present on chromosome are segments of DNA.

Since every individual begins life as a single cell, the DNA contained in all the cells of an individual is identical.