Genetics is the science of heredity and variation. Basteson coined the term genetics in 1905. Heredity is the cause of similarities between individuals. For this reason, brothers and sisters with the same parents resemble each other. Variation is the cause of the differences between individuals. This is the reason that brothers and sisters who do resemble each other are still unique individuals. Precisely, genetics is a branch of biology that deals with the mechanisms responsible for transmission of biological properties from one generation to the next. Thus, genetics deals with understanding the nature, molecular structure, organization, biological function, regulation, and manipulation of hereditary particles called genes, which play a central role in life processes. It also covers the development of ways and means to use the knowledge of genetics for the welfare of mankind.