Genetic Studies of Rabbits and Rats (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Genetic Studies of Rabbits and Rats

But in a majority of cases variation due to genetic causes occurs in association with that due to non-genetic or environmental causes; in fact, it is possible to distinguish between the two only by the results of systematic selection. When the environment is kept constant and a race does not change in response to selection, we assume that no genetic variation is present. But if the race does change in response to selection, we have no alternative but to assume that the variation is genetic in character. Body-size in birds and mammals shows well the simultaneous yet distinct action of genetic and non-genetic agencies. The amount and quality of the food supplied to an animal limits its size, yet if food is supplied in abun~ dance and of proper quality, some races of animals attain greater size than others. This is the result of genetic differences.

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