Heredity of colours, eyes, codes and drawings MCO
Colours
Heredity of colours – what kittens are born when colours are combined
Colours: n – black, d – red, e – cream, a – blue, f – black tortoise, g – blue tortoise
If one of the parents is white, the kitten can be with or without white.
MCO – colour codes:
a – blue
d – red
e – cream
f – black tortie/tortoise
g – blue tortie/tortoise
n – black
s – silver/smoke
w – white
y – gold
MCO – drawing codes
11 – shaded
12 – powder
21 – drawing unspecified
22 – marbled/blotched tabby
23 – mackerel/striped tabby
24 – dotted/spotted tabby
25 – ticked tabby
MCO – spot codes white
MCO – eye colour codes
61 – blue eyes
62 – orange/amber eyes
63 – eyes of different colours
64 – green eyes
Heterochromie
The scientific word for variegation is heterochromia iridium (multicoloured iris). It can be genetic (inherited), a congenital (developmental) defect or acquired (disease, medication, injury). It usually occurs in cats with white fur or white spots (van, harlequin, bicolor). It is also occasionally seen in colored cats. Odd eyes are usually seen in epistatic white cats where one eye is blue and the other is orange, yellow or green. Another form of strange eyes is seen in white cats where one eye has a tapetum lucidum (glow in the dark green eye) and one eye lacks a tapetum (glow in the dark red eye). These different eye glows are seen in reflected lights or flash photography.
The blue eyes
All kittens are born with blue eyes, which does not mean that they will remain this colour in adulthood. In a few breeds this colour is permanent, but in most kittens it is replaced by another colour at 6-7 weeks. The blue colour depends on how intense the blue refraction is.
Blue eyes also occur in white cats and are associated with the epistatic white (often called dominant white) gene, which is quite different from albinism because it masks the underlying coat color. The white spotting gene also affects eye pigment if there are white spots around the eyes. White cats may have one or both eyes blue. The non-blue eye will be whatever color the breed standard calls for, in white cats of the main coon breed the other eye is amber or green.
Dichromacy – dichromatic eyes
Partial heterochromia (dichrotic eye) occurs when different amounts of melanocytes or melanocytes with different levels of activity are present in different areas of the same iris. These are the so-called “pie slice” effects. Dichromatic eyes have two colours in the iris. One or both eyes may be affected. If both eyes are affected, a mirror effect can occur, which looks very interesting and even attractive.
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