| Coat
Colour |
|
B
- Brown Locus
|
| Genotype |
Description |
Phenotype |
| B/B |
Homozygous
- Black/Brown |
Black/Brown |
| B/b |
Heterozygous
- Black/Brown - carries Chocolate |
Black |
| B/bl |
Heterozygous
- Black/Brown - carries Cinnamon |
Black |
| b/b |
Homozygous
- Chocolate |
Chocolate |
| bl/bl |
Homozygous
- Cinnamon |
Cinnamon
- reddish chocolate |
| b/bl |
Heterozygous
- Chocolate - carries Cinnamon |
Chocolate |
| The
Chocolate allele whilst recessive to the Black
allele is dominant to cinnamon. Thus a chocolate
cat can carry the cinnamon allele, a Black cat can
carry either chocolate or cinnamon and a cinnamon
cat can only be homozygous cinnamon. |
| ba
- Barrington Brown Locus (example
only) |
| Genotype |
Description |
Phenotype |
| Ba/Ba |
Homozygous
- Non Barrington Brown |
Cat
unaffected - ie Black/Brown/Chocolate etc |
| Ba/ba |
Heterozygous
- Non Barrington Brown - carries Barrington Brown |
Cat
unaffected - ie Black/Brown/Chocolate etc |
| ba/ba |
Homozygous
- Barrington Brown -liberty of renaming |
Mahogany
Brown/Light Brown/milk coffee in colour |
| I
took the liberty of renaming Shaw's Barrington
Brown allele so that it could be used as an
example of a recessive brown locus in this table.
The Barrington brown cats were b/b/, ba/ba - the
two alleles had an additive effect on each other
and created the pale milk coffee coloured cats. It
has only been added as an example as they colony
of cats were never seen outside the laboratory nor
did any of the cats leave the laboratory. But it
is an example of a further recessive brown locus. |
|
|
