Gregor Mendel Quotes

“The fundamental biological variant is DNA. That is why Mendel's definition of the gene as the unvarying bearer of hereditary traits, its chemical identification by Avery (confirmed by Hershey), and the elucidation by Watson and Crick of the structural basis of its replicative invariance, are without any doubt the most important discoveries ever made in biology. To this must be added the theory of natural selection, whose certainty and full significance were established only by those later theories.”
― Jacques Monod, Chance and Necessity: An Essay on the Natural Philosophy of Modern Biology

“In Darwin's time no serious attempt had been made to examine the manifestations of variability. A vast assemblage of miscellaneous facts could formerly be adduced as seemingly comparable illustrations of the phenomenon "Variation." Time has shown this mass of evidence to be capable of analysis. When first promulgated it produced the impression that variability was a phenomenon generally distributed amongst living things in such a way that the specific divisions must be arbitrary. When this variability is sorted out, and is seen to be in part a result of hybridisation, in part a consequence of the persistence of hybrids by parthenogenetic reproduction, a polymorphism due to the continued presence of individuals representing various combinations of Mendelian allelomorphs, partly also the transient effect of alteration in external circumstances, we see how cautious we must be in drawing inferences as to the indefiniteness of specific limits from a bare knowledge that intermediates exist.”
― William Bateson, Problems of Genetics

“There is nothing opposed in Biometry and Mendelism. Your husband and I worked that out at Peppards [on the Chilterns] and you will see it referred in the Biometrika memoir. The Mendelian formula leads up to the 'ancestral law'. What we fought against was the slovenliness in applying Mendel's categories and asserting that such formulae apply in cases when they did not.”
― Karl Pearson