Genetic chart on this page
Charts genetics of Colour and Pattern on this page
Simon Twigge on genetics - this is on this page
Horizons on Genetics Notes and Genetics discussion - this goes to Horizons pages and is a detailed discussion with illustrations
||non agouti, self
||full colour, full expression
||sepia, Burmese restriction (in Burmese), pointed
In the self cats [d/d] this gene can be seen as a lighter colour and is called Caramel in blue tones, Taupe in lilac, and Apricot in cream tones. They are sometimes talked of as the powder coats. In the dense [D/-] cats that are also sepia [cbcb] is is sometimes called the Berrington gene . It is most often identified in b/b, cb/cb, (champagne)cats. We suggest these terms not be used.
||golden, not silver, rufosed, rofused
||longhair, semi longhair (there are 4
genes that add up to deliver the very long hair)
||orange, tortie (F only)
||not orange (usually not noted)
||abbytabby (our term)
||not abbytabby, macheral tabby, classic tabby,
||wide band, shaded (in A/-), smoke (in a/a)
||narrow band, ticked, non smoke, (usually not noted)|
||narrow band, not tipped, ticked (usually not noted)||swb/swb
||tipped or superwide band
requires that we
consider Mc and Sp.
||spotted tabby (this spotting can vary in
name and apperance depending on if the cat is a mackerel or classic by
||non spotted, (usually not noted)
Wide band is new, hypothesized by Robinson’s, and recently accepted
by Ms Stephens in her latest edition. We accept it as fact as you
see. We are beginning to think of very wide band cats as in the
super wide band (swb), normal/not being SWB. This is our descriptor, as
know of no other. We could use the term Tipped but there does appear to
be some assocaition with wide band.
We have discounted Dm, Dilute/non modifier (from Robinson’s 4th ed p141) after running it for some time. Thus the terms Caramel, Taupe and Apricot are not used. We do not dispute their existance rather we understand these are the minor colour variations one does see (in the solid cats -most particularly the "dilutes") due to the underlying golden /silver variable that becomes clearly visible and is identified in the tabby [agouti] cats.
Simon Twigge on genetics.
Simon is a senior member of the Breed Society in England. ( if I have
stated that correctly)
We make the following comments to this very sound document.
1) The reader will note it is marked as copywritten and dated.
2) The chart format that he uses is particularly good and we have presented it above with additions and modifications as we see them - We do not use superscript as it makes typing more difficult and for no other reason. We separate nomenclature with slash and comma as in [ [ a/a,] .and we have placed the symbols in alphabetical order.
3) We hope the reader is not intimidated by the large numbers and mathematics- they are not necessary to the use and understanding for applied breeding.
4) We do not agree that DM exists and have stated our reasons on our Genetics pages.The recessive of O/- is o/o or o/y.
5) Simon's table 2 is very useful to the understanding however we do not agree on his definition of Smoke. We see it as a/a, Wb/-. The issue of a smoke's i/i is still open for us. BUT time will tell. - -variants genotype has an extra b. Perhaps Simon has updated since '99.
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