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Genetics

Cattery Elvëa Mëoi

Genetics - Crossbreeding tables (page 2)

General introduction - Tabby Points

S	Seal point (aa BB cscs DD)	Sb	Seal, carrier dilution (blue) (aa BB cscs Dd)
Sc	Seal, carrier choc (aa Bb cscs DD)	Sbc	Seal, carrier choc and blue (aa Bb cscs Dd)
B	Blue point (aa BB cscs dd)	Bc	Blue, carrier choc (aa Bb cscs dd)
C	Chocolate point (aa bb cscs DD)	Cb	Choc, carrier blue (aa bb cscs Dd)
L	Lilac point (aa bb cscs dd)	Ci	Cinnamon point (aa b1b1 cscs DD)
Cib	Cinnamon, carrier blue (aa b1b1 cscs Dd)	F	Fawn point (aa b1b1 cscs dd)
ST	Seal Tabby (AA BB cscs DD)	St	Seal Tabby, carrier non-a (Aa BB cscs DD)
STb	Seal Tabby, carrier blue (AA BB cscs Dd)	Stb	Seal Tabby, carrier non-a and blue (Aa BB cscs Dd)
STc	Seal Tabby, carrier choc (AA Bb cscs DD)	Stc	Seal Tabby, carrier non-a and choc (Aa Bb cscs DD)
etcetera, etcetera

Table 1. Crossbreeding between a Seal point and Seal, Blue, Chocolate or Lilac Point, after Kik van Eijsden 1977.

Colour parents	1 S	2 Sb	3 Sc	4 Sbc		5 B	6 Bc	7 C	8 Cb	9 L
I S	S	S Sb	S Sc	S Sb Sc Sbc		Sb	Sb Sbc	Sc	Sc Sbc	Sbc
II Sb	S Sb	S Sb Sb B	S Sb Sc Sbc	S Sb Sb Sc Sbc Sbc B Bc		Sb B	Sb Sbc B Bc	Sc Sbc	Sc Sbc Sbc Bc	Sbc Bc
III Sc	S Sc	S Sb Sc Sbc	S Sc Sc C	S Sb Sc Sc Sbc Sbc C Cb		Sb Sbc	Sb Sbc Sbc Cb	Sc C	Sc Sbc C Cb	Sbc Cb
IV Sbc	S Sb Sc Sbc	S Sb Sb Sc Sbc Sbc B Bc	S Sb Sc Sc Sbc Sbc C Cb	S Sb Sb Sc Sc Sbc Sbc Sbc Sbc B Bc Bc C Cb Cb L		Sb Sbc B Bc	Sb Sbc Sbc B Bc Bc Cb L	Sc Sbc C Cb	Sc Sbc Sbc Bc C Cb Cb L	Sbc Bc Cb L

Ofcourse a litter of 16 kittens between two Seal points both carrier of blue and choc (two Sbc) is not realistic. Approximately 9/16 (about 56%) will be Seal point, 3/16 Blue point, 3/16 Chocolate point (both about 18%) and only 1/16 Lilac point (6%). With a nest of four kittens you'll probably get 2 Seal point, 1 Blue point and 1 Chocolate point. But you can never say for sure, nature can surprise us!

Table 2. Crossbreeding between a Blue point and a Blue, Chocolate, Lilac or Seal point, after Kik van Eijsden 1977.

Colour parents	1 B	2 Bc	3 C	4 Cb	5 L	6 S	7 Sb	8 Sc	9 Sbc
I B	B	B Bc	Sbc	Sbc Bc	Bc	Sb	Sb B	Sb Sbc	Sb Sbc B Bc
II Bc	B Bc	B Bc Bc L	Sbc Cb	Sbc Bc Cb L	Bc L	Sb Sbc	Sb Sbc B Bc	Sb Sbc Sbc Cb	Sb Sbc Sbc B Bc Bc Cb L

Table 3. Crossbreeding between a Chocolate point and a Chocolate, Lilac, Blue or Seal point, after Kik van Eijsden 1977.

Colour parents	1 C	2 Cb	3 L	4 B	5 Bc	6 S	7 Sb	8 Sc	9 Sbc
I C	C	C Cb	Cb	Sbc	Sbc Cb	Sc	Sc Sbc	Sc C	Sc Sbc C C
II Cb	c Cb	C Cb Cb L	Cb L	Sbc Bc	Sbc Bc Cb L	Sbc Sc	Sbc Sbc Sc Bc	Sbc Sc C Cb	Sbc Sbc Sc Bc Cb Cb C L

Table 4. Crossbreeding between a Lilac point and a Lilac point, Seal with blue and choc, Blue with choc and Choc with blue, after Kik van Eijsden 1977.

Colour parents	1 L	2 Sbc	3 Bc	4 Cb
I L	L	Sbc Bc Cb L	Bc L	Cb L

All other possibilities can be found in tables 1-3.

Considering Tabby points it's more complicated, this is because the agouti gene isn't the only gene that plays a part in this, the gene for Tabby pattern (gene T) plays a part as well. This Tabby gene can, in combination with Agouti (A), take care of four different Tabby patterns: Abyssinian pattern (Ta), Meckerel (Tm), Spotted (Ts), and Blotched (Tb). In case of a Tabby Point Siamese the only visible stripes are those on the points, which pattern it is can't be seen. It is not that clear either how a combination of two Tabby alleles works out and what the resulting Tabby pattern is. I won't go into that any further, all that matters is that allele A (Agouti) is dominant over allele a (non-agouti), this means that the cat is a Tabby point if it has only one allele A. In the next tables I will use an abbreviation again for clarity, T means a cat has two Agouti alleles (AA) and t means that the cat has one Agouti allele and one non-agouti allele (Aa).

Table 5. Crossbreeding between a Seal Point and a Seal Tabby Point.

Colour parents	1 ST	2 St	3 STb	4 Stb	5 STc	6 Stc	7 STbc	8 Stbc
I S	St	S St	St Stb	St Stb S Sb	St Stc	St Stc S Sc	St Stb Stc Stbc	St Stb Stc Stbc S Sb Sc Sbc
II Sb	St Stb	St Stb S Sb	St Stb Stb Bt	St Stb Stb Bt S Sb Sb B	St Stb Stc Stbc	St Stb Stc Stbc S Sb Sc Sbc	St Stb Stb Stc Stbc Stbc Bt Btc	St Stb Stb Stc Stbc Stbc Bt Btc S Sb Sb Sc Sbc Sbc B Bc
III Sc	St Stc	St Stc S Sc	St Stb Stc Stbc	St Stb Stc Stbc S Sb Sc Sbc	St Stb Stb Ct	St Stc Stc Ct S Sc Sc C	St Stb Stc Stc Stbc Stbc Ct Ctb	St Stb Stc Stc Stbc Stbc Ct Ctb S Sb Sc Sc Sbc Sbc C Cb
IV Sbc	St Stb Stc Stbc	St Stb Stc Stbc S Sb Sc Sbc	St Stb Stb Stc Stbc Stbc Bt Btc	St Stb Stb Stc Stbc Stbc Bt Btc S Sb Sb Sc Sbc Sbc B Bt	St Stb Stc Stc Stbc Stbc Ct Ctb	St Stb Stc Stc Stbc Stbc Ct Ctb S Sb Sc Sc Sbc Sbc C Cb	St Stb Stb Stc Stc Stbc Stbc Stbc Stbc Bt Btc Btc Ct Ctb Ctb Lt	St Stb Stb Stc Stc Stbc Stbc Stbc Stbc Bt Btc Btc Ct Ctb Ctb Lt S Sb Sb Sc Sc Sbc Sbc Sbc Sbc B Bc Bc C Cb Cb L

The Old-Style Siamese Club (UK) made a very good chart in Microsoft Excel with % on possible colours between cats of the original colours, Seal, Blue, Chocolate and Lilac. You can download it here! With much gratitude to Margaret Lindgren of the Old-Style Siamese Club (UK)!

General introduction - Tabby Points

This page is not complete, but I'm available for questions and comment, did I forget anything or are there any errors? Mail me: elinegeertsema@solcon.nl

Sources: Houden van Siamezen by Kik van Eijsden from 1977 (Uitgeversmaatschappij Holland in Haarlem, The Netherlands)

Oosterse korthaarkatten by K. van der Wijk from 1982 (Zuidgroep BV Uitgevers in Best, The Netherlands)

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Date Last Modified: 06-06-2007
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