Heredity in the light of recent research / by the late L. Doncaster.
- Doncaster, L. (Leonard), 1877-1920.
- Date:
- 1921
Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Heredity in the light of recent research / by the late L. Doncaster. Source: Wellcome Collection.
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![I] INTRODUCTION have obtained a form difíerent from either parent. But if we mate the same black parent with another white individual, it may happen that all the offspring are black, and instead of reverting to the wild form they all follow one parent. If either the greys or blacks produced in this way are mated together, some of their young will be white ; although none of the children of the original white individual resembled their white parent in colour, yet the white has appeared again among the grandchildren after skipping a generation. In man, a colour-blind father rarely has colour-blind children, but some of his nephews and male grandchildren through the female line are usually affected ; that is to say, the disease appears in males but is transmitted by females. It is clear from this short list of examples that there are a number of different forms of hereditary transmission, and our object must be, first to classify them into groups in which the behaviour is similar, and next to attempt to bring them under a common scheme. And it is also clear that the different kinds of heredity are associated with different kinds of variation ; for example variation in height in man is inherited differently from variation in colour-vision, and both differ from variation of coat-colour in rabbits, in their inheritance. A question of a different kind is the cause of inherited differences, and whether differences due to](https://iiif.wellcomecollection.org/image/b18027143_0022.JP2/full/800%2C/0/default.jpg)
