Since ancient times, man seeks to understand how does the transmission of characteristics from one being to another. The first ideas about heredity were quite simple and only said the children were similar to parents, without understanding the mechanism behind this finding. Genetics is the part of biology that studies heredity, that is, the way the features are passed on from generation to generation. It is considered that this science began with the experiments and laws proposed by a monk named Gregor Mendel, in a paper published in 1866. Mendel expected, with the development of his work with peas, understand why the cross between hybrid generated such different descendants. According to some authors, these works, Mendel intended to create ways to develop hybrid plants that retain essential characteristics for agriculture.