Summary
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(1)
The normal facts of inheritance of black, yellow and tortoiseshell can be explained only by supposing either that both colours are sexlinked, or thatone only is sex-linked and completely dominant to the other in the male, incompletely dominant in the female.
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(2)
Black hairs have been found in all yellow cats of either sex examined by us, and this practically disproves any sex-difference in the dominance of black and yellow. There remains, therefore, as the only alternative, the sex-linkage of both colours.
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(3)
In the course of our investigations a yellow female appeared, showing and transmitting a very small amount of black-spotting which did not segregate from the yellow. We subsequently found thatall yellow cats have a few black hairs. These facts suggest that in the past and again during our experiments there has been fractionation of a factor.
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Bamber, R.C., Herdman, E.C. The inheritance of black, yellow and tortoiseshell coat-colour in cats. Journ. of Gen. 18, 87–97 (1927). https://doi.org/10.1007/BF03052604
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DOI: https://doi.org/10.1007/BF03052604