Mendelism / by R.C. Punnett.

  • Punnett, Reginald Crundall, 1875-1967.
Date:
1905
Catalogue details

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

Credit: Mendelism / by R.C. Punnett. Source: Wellcome Collection.

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    récessives always bred true, resembling in this way the original parents. The impure dominants, on the other hand, always gave dominants and récessives in the constant pro portion of 3:1. Since the pure dominants are only half as numerous as the impure dominants, it follows that the impure domin ant, on being *selfed, produces as offspring pure dominants, impure dominants, and ré cessives in the proportion of 1 :2 :1. And this held good for all impure dominants, no matter in what generation they were bred. We have considered the case of one pair of characters only, but Mendel shewed that the rule holds good for all the various pairs of differentiating characters studied by him. Wherever there occurs a pair of differentia ting characters, of which one is dominant to the other, three possibilities exist. There are récessives which always breed true to the recessive character. There are dominants * See note at end, p. 61. ( 10) i