Breeding and the Mendelian discovery / by A.D. Darbishire ... with illustrations in colour and black-and-white.

  • Arthur Dukinfield Darbishire
Date:
1911
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Breeding and the Mendelian discovery / by A.D. Darbishire ... with illustrations in colour and black-and-white. Source: Wellcome Collection.

    300/370 page 218
    N 2i8 breeding etc. Now this is demonstrably untrue, and no one familiar with. Mendelian phenomena ever made such a statement. Pure and extracted forms are only- supposed to be identical in respect of particular character or characters. For instance, the albinos which appeared in the second hybrid generation of my experiment, though to all appearances identical with the pure albinos, proved themselves, when mated with waltzers, to be very difíerent from them in their breeding properties. For amongst the ofíspring of extracted albinos mated with waltzers there appeared pink-eyed and even albino mice, forms which are never produced when pure albinos are mated with waltzers ; and this fact was hailed by objectors to the Mendelian theory as a conclusive proof of the falsity of the doctrine of the purity of the gamete. We have met you on your own ground, they declared, and have defeated you. Here were two albinos which ought, according to your theory, to be identical. We tested the con¬ tents of their germ cells according to your teaching, and we have demonstrated that they are funda¬ mentally difíerent. But a familiarity with the Mendelian account of reversion, to be given in the next chapter, will at once explain how such a result could occur and be in perfect accord with MendeUan theory as now held. There were, in all probability, amongst the albinos]^in my second hybrid generation three zygotic types corresponding to the three zygotic types of white-flowered peas in the second hybrid generation
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