There is quite a large literature discussing Mendel's paper, much concerned with the apparent statistical irregularities. Prominent among the authors are Fisher (who started the statistical questioning), Weiling (who "defends" Mendel), a host of people commenting on Fisher, many seeking to dispute his conclusions, and Edwards (Biol. Rev. 61, 1986: 295-312). Many of these references can be found in Edwards' paper, others in Orel's biography of Mendel: "Gregor Mendel the first geneticist". Orel cites a 1994 paper he co-wrote with a well-known geneticist Hartl, apparently suggesting that if Mendel tested *more* than 10 plants each time when seeking to ascertain the genetic composition of the dominant offspring of his cross of hybrids, then the problems go away. Make up your own mind.