On the Origin of the Tortoiseshell Male Cat -a Correction

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1. The gene for orange coat color in cats is sex-linked, while the gene for black or tabby is autosomal. The former, in the homozygous or homozygous state, is completely epistatic to the effect of the latter, while, in the heterozygous state, the former covers only partially the effect of the latter, and a tortoiseshell female is produced.<br>2. The exceptional tortoiseshell male may be borne of either a tortoiseshell, or an orange, or a black mother. It is a male of complete sterility, but not an intersex.<br>3. As to the cause of such an exceptional male and its sterility, the writer's working hypothesis postulating an unequal crossing-over between the X-chromosomes of a tortoiseshell mother is untenable. Instead, crossing-over between X and Y of the father which transfers the gene for orange color from X to Y, and reciprocally the factor-complex for fertility from Y to X, seems to be a more plausible explanation. This hypothesis also can account for the origin of exceptional black females from a black or tortoiseshell mother and an orange father.

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