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...

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...

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...