• Crosses with Siamese Cats

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    • Abstract


      Siamese cats have, instead of normal chromogen a weakened chromogen factor, which in cooperation with pigment factors causes the coat and eye colours characteristic for the breed.

      The chocolate black of the Siamese reappears in its full intensity in crosses introducing the normal chromogen and is then epistatic over tabby.

      The white Persians used in this experiment do not possess the chocolate black, but carry another pigment factor or factors whose allelomorphs cause tabby pattern, that is, striping and pigment suppression on the feet and ears.

      The combination of the Siamese colouring and the tabby pattern can give rise to a new type of cats, the striped Siamese.

      The absence of colour in white Persians is caused by a dominant factor suppressing pigment nearly totally in the hairs and elsewhere.

      This factor seems, however, to be of a quantitative nature and to be balanced by an agent that causes a certain area to be unaffected by this suppressor. This area varies in extent and may include the eyes (one, both or parts) and a spot on the neck or occipnt.

      Pigmentation of the iris stroma is always accompanied by the presence of a tapetum lucidum in the choroid.

      The heterophthalmy found in some white Persians and also in several hybrids is caused by the quantitative reaction ofD with the agent that limits its sphere of influence.

      Both coat and eye pigments are influenced by quantitative physiological processes whose nature has not yet been disclosed.

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  • Journal of Genetics | News

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      Posted on July 25, 2019

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