By Roy Robinson and G. A. Kerkut (Auth.)
The technological know-how of genetics has a lot to supply to either the idea and perform of breeding. This variation comprises advancements and outlines of recent breed and color kinds
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Extra info for Genetics for Cat Breeders
The second qualification has to do with the problem of lack of recogni tion of the combinations because of epistatis. This is especially true for colour mutants. In general, each additional gene will result in a reduction in colour until a nearly white or white animal is engendered. The cat with the greatest number of recessive genes is the lilac Siamese of geno type aabbc'c'dd. If to this is added the gene for long hair, the Lilac Colourpoint will result, of genotype aabbc'cfssddll Or, a Cornish rex version could be produced, of genotype aabbc'c^ddrr.
9. The explanation for the three colours resides in the random assortment of the genes and versus C and c^ and the dominance relationships between the genes. This example illustrates the care which has to be exercised at times in the interpretation of breeding results. TABLE 3. PHENOTYPES PRODUCED BY COMBINATIONS OF THE ALBINISTIC SERIES OF ALLELES Appearance Genotype With agouti C C , Cc\ Cc\ c^c\ Λ ^ c^c cc Cc^, Cc Tabby Sepia tabby (dark) Sepia tabby (light) Tabby Siamese Blue-eyed albino Pink-eyed albino With non-agouti Black Burmese (dark) Burmese (light) Seal Siamese Blue-eyed albino Pink-eyed albino The dominance relationships between the various alleles are sum marized by Table 3.
While a XXY constitution can produce an externally normal male, the animal is usually sterile. Other unusual constitutions which have been found are cats with mixtures of XX and XY cells, of XX and XXY cells and of XY and XXY cells. These combinations occur because of rare mishaps of either fertiliza tion or of cell division. In each case, the animal is a male or is predomi nantly male externally. Most often, they are sterile but not invariably. Some of the above combinations do not necessitate sterility and it is a fact of observation that some tortoiseshell males are known to be fertile.
Genetics for Cat Breeders by Roy Robinson and G. A. Kerkut (Auth.)