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Mendelism The theory of heredity that forms the basis of classical genetics, proposed by Gregor Mendel in 1866 and formulated in two laws (see Mendel's laws; particulate inheritance). Mendel suggested that individual characteristics were determined by inherited `factors', and when improved microscopes revealed details of cell structure the behaviour of Mendel's factors could be related to the behaviour of chromosomes during meiosis.

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Mendelism the theory of hereditiy as formulated by the Moravian monk Gregor Johann Mendel (1822–84), the father of genetics. From systematically breeding peas he demonstrated the transmission of characteristics in a predictable way by factors (genes) which remain intact and independent between generations and do not blend, though they may mask one another's effects.