Gregor Mendel was considered the father of genetics. Between 1863 and 1865, Mendel conducted several experiments regarding the crossbreed of pea plants in specific combinations. Through the experiment, he found out that when a yellow pea and a green pea were bred together, their offspring was always yellow. By this, Mendel discovered the term of 'recessive' and 'dominant' in relations to traits and genetics, and in this case, the green pea trait was recessive and the yellow pea trait was dominant. After his significant discovery, he published a paper describing a 'invisible' factor affecting the traits in a predicatable way, which is what we know today as genes.