Mendel's principles of heredity : a defence / by W. Bateson ; with a translation of Mendel's original papers on hybridisation.

Date:
1902
Catalogue details

Licence: In copyright

Credit: Mendel's principles of heredity : a defence / by W. Bateson ; with a translation of Mendel's original papers on hybridisation. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    198/239 (page 175)
    Poleccat are two distinct species, because, as everybody ought to know, The result of a cross between albino and normal [of one species] is always a constant one, namely an offspring like the father at least in colour* -whereas in crosses (between species) this is not the case. And again, after reciting that the Ferret-Polecat crosses gave' intermediates, he states : But all this is not the case in crosses between albinos and normal animals within the species, in which always and without any exception the young resemble the father in colour t. These are admirable illustrations of what is meant by a tiniversal proposition. But von Fischer doesn't stop here. He proceeds to give a collection of evidence in proof of this truth which he says ought to be known to every- one. He has observed the fact in regard to albino mole, albino shrew {Sorex araneus), melanic squirrel {Sciurus vulgaris), albino ground-squirrel {Hypudaeus terrestris), albino hamster, albino rats, albino mice, piebald (grey- and-white or black-and-white) mice and rats, partially albino sparrow, and we are even presented with two cases in Man. No single exception was known to von Fischer |. * Das Kesultat einer Kreuzung zwischen Albino- und Normal- form ist stets, also, constant, ein dem Vater mindestens in der Farbung gleiches Junge. This law is predicated for the case in which both parents belong to the same species. t Dieses Alles ist aber nie der Fall bei Kreuzungen unter Leucismen und normalen Thieren innerhalb der Species, bei denen stets und ohne jede Ausnahme die Jimgen in Fdrbu7ig dem Vater gleichen. t He even withdraws two cases of his own previously published, in which grey and albino mice were alleged to have given mixtures, saying that this result must have been due to the broods having been accidentally mixed by the servants in his absence.