Experiments in plant hybridisation / Mendel's original paper in English translation, with commentary and assessment by Sir Ronald A. Fisher, together with a reprint of W. Bateson's biographical notice of Mendel ; edited by J.H. Bennett.

  • Mendel, Gregor, 1822-1884. Versuche über Pflanzenhybriden. English
Date:
[1965]
Catalogue details

Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Experiments in plant hybridisation / Mendel's original paper in English translation, with commentary and assessment by Sir Ronald A. Fisher, together with a reprint of W. Bateson's biographical notice of Mendel ; edited by J.H. Bennett. Source: Wellcome Collection.

    50/116 (page 36)
    Зб EXPERIMENTS IN PLANT HYBRIDISATION earlier in connection with the experiments on the form of the seed and the colour of the albumen. The true ratios of the numbers can only be ascertained by an average deduced from the sum of as many single values as possible; the greater the number the more are merely chance effects eliminated. ^ The developmental series for hybrids in which two kinds of differentiating characters are united contains among sixteen individuals nine different forms, viz.: АВ-\-АЪ -\-аВ 4 аЬ-\-2АВЪ-{-2аВЬ -\-2AaB-\-2Aab -\-^AaBb. Between the differentiating characters of the original stocks Aa and Bb four constant combinations are possible, and consequently the hybrids produce the corresponding four forms of egg and pollen cells AB, Ab, аВ, ab, and each of these will on the average figure four times in the fertilisation, since sixteen individuals are included in the series. Therefore the participators in the fertilisation are Pollen cells AB-\-AB-\-AB-\-AB-\-Ab^Ab-\-Ab-\-Ab^aB -\-аВ -\-аВ -^аВ -^ab -{-ab -{-ab -\-ab. Egg cells AB-\-AB-{-AB'\-AB-{-Ab-{-Ab-\-Ab-{-Ab-{-aB -\-аВ -\-аВ -\-аВ -\-ab -\-ab -\-ab -\-ab. In the process of fertilisation each pollen form unites on an average equally often with each egg cell form, so that each of the four pollen cells AB unites once with one of the forms of egg cell AB, Ab, аВ, ab. In precisely the same way the rest of the pollen cells of the forms Ab, аВ, ab unite with all the other egg cells. We obtain therefore AB AB AB AB Ab Ab j_^b Ab AB Ab oB ab AB Ab аВ ab аВ аВ аВ аВ ab ab ûA cA AB Ab äB ab AB M ÖB ab' or AB + ABb + AaB + AaBb + ABb + Ab + AaBb + Aab + AaB + AaBb -\- аВ аВЬ + AaBb + Aab + aBb + ab = AB Ab + аВ 4- ab + 2ABb + 2aBb + 2AaB + 2Aab + \AaBb. * [In the original the sign of equality (=) is here represented by +, evidently a misprint.]