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As mentioned above, he argues from the fact that injury or disease of the ovaries may lead to the development of male characters in the female, that the female is heterozygous for sex, and from the supposed fact that castration of the male leads merely to the non-appearance of male somatic characters, that the female sex-factor is wanting in the male.
The barred character like grossulariata is dominant, the unbarred recessive, and to explain the results it is necessary to assume that the female is not only heterozygous for the barred character, but also for sex, with the female sex-factor dominant.
The recessive character in this case is linked to the female sex chromosome, or, as Bateson described it, the dominant character is repelled by the sex-factor. We may make a diagram of the kind given by Morgan if we use a rod of different shape for the female-producing sex-chromosome, and use the black rod for the dominant character:
Even then, they tried to keep to the resolution they had made; but this, it seemed, was not within the power of flesh and blood; and so, once more, the sex-factor was introduced into the complications of their lives. To Thyrsis this thing was like some bird of prey that circled in the sky just above him its shadow filling him with a continual fear, the swish of its wings making him cringe.
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