follows from the ordinary conventions of genetic terminology that the wild-type gene at the same locus, the gene that the rest of the population has in double dose, would properly be called a gene “for reading.” If you object to that, you must also object to our speaking of a gene for tallness in Mendel’s peas.… In both cases the character of interest is a difference, and in both cases the difference only shows itself in some specified environment. The reason why something so simple as a one gene difference can have such a complex effect … is basically as follows. However complex a given state
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