© 2008 by Ihr Name / Ihre Unternehmen    Alle Rechte vorbehalten    E-Mail: kontakt@unternehmen.de
Colour Genetics - A simple guide
________________________________________________________________________________

You can use the tables below to work out expected kitten colours from different coloured sires and dams. Below these is a simple guide to coat colour inheritance.
Genetics
Copyright © 2016  -  Amurusko Norwegian Forest Cats  -  All Rights Reserved  -  Email: dawn@amurusko.co.uk
Dams Across

Sires Below
Black Black
(Carrying Dilute)
Blue
(Dilute)
Black Black Males

Black Females
Black Males

Black Females

50% kittens carry dilute
Black Males

Black Females

All kittens carry dilute
Black
(Carrying Dilute)
Black Males

Black Females


50% kittens carry dilute
Black Males
Blue Males
Black Females
Blue Females

50% non dilute kittens carry dilute
Black Males
Blue Males
Black Females
Blue Females

All non dilute kittens carry dilute
Blue
(Dilute)
Black Males

Black Females


All kittens carry dilute
Black Males
Blue Males
Black Females
Blue Females

All non dilute kittens carry dilute
Blue Males

Blue Females
Dams Across

Sires Below
Black Black
(Carrying Dilute)
Blue
(Dilute)
Red Black Males

Tortie Females
Black Males

Tortie Females

50% kittens carry dilute
Black Males

Tortie Females

All kittens carry dilute
Red
(Carrying Dilute)
Black Males

Tortie Females


50% kittens carry dilute
Black Males
Blue Males
Tortie Females
BlueTortie Females

50% non dilute kittens carry dilute
Black Males
Blue Males
Tortie Females
BlueTortie Females

All non dilute kittens carry dilute
Cream
(Dilute)
Black Males

Tortie Females


All kittens carry dilute
Black Males
Blue Males
Tortie Females
BlueTortie Females

All non dilute kittens carry dilute
Blue Males

Blue Tortie Females
Dams Across

Sires Below
Black Tortie Black Tortie
(Carrying Dilute)
Blue Tortie
(Dilute)
Black Black Males
Red Males
Black Females
Tortie Females
Black Males
Red Males
Black Females
Tortie Females

50% kittens carry dilute
Black Males
Red Males
Black Females
Tortie Females

All kittens carry dilute
Black
(Carrying Dilute)
Black Males
Red Males
Black Females
Tortie Females





50% kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Black Females
Blue Females
Tortie Females
Blue Tortie Females

50% non dilute kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Black Females
Blue Females
Tortie Females
Blue Tortie Females

All non dilute kittens carry dilute
Blue
(Dilute)
Black Males
Red Males
Black Females
Tortie Females





All kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Black Females
Blue Females
Tortie Females
Blue Tortie Females

All non dilute kittens carry dilute
Blue Males
Cream Males
Blue Females
BlueTortie Females
Dams Across

Sires Below
Black Tortie Black Tortie
(Carrying Dilute)
Blue Tortie
(Dilute)
Red Black Males
Red Males
Red Females
Tortie Females
Black Males
Red Males
Red Females
Tortie Females

50% kittens carry dilute
Black Males
Red Males
Red Females
Tortie Females

All kittens carry dilute
Red
(Carrying Dilute)
Black Males
Red Males
Red Females
Tortie Females






50% kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Red Females
Cream Females
Tortie Females
Blue Tortie Females


50% non dilute kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Red Females
Cream Females
Tortie Females
Blue Tortie Females


All non dilute kittens carry dilute
Cream
(Dilute)
Black Males
Red Males
Red Females
Tortie Females






All kittens carry dilute
Black Males
Blue Males
Red Males
Cream Males
Red Females
Cream Females
Tortie Females
Blue Tortie Females


All non dilute kittens carry dilute
Blue Males
Cream Males
Cream Females
BlueTortie Females
Dams Across

Sires Below
Red Red
(Carrying Dilute)
Cream
(Dilute)
Black Red Males

Tortie Females
Red Males

Tortie Females

50% kittens carry dilute
Red Males

Tortie Females

All kittens carry dilute
Black
(Carrying Dilute)
Red Males

Tortie Females


50% kittens carry dilute
Red Males
Cream Males
Tortie Females
Blue Tortie Females

50% non dilute kittens carry dilute
Red Males
Cream Males
Tortie Females
Blue Tortie Females

All non dilute kittens carry dilute
Blue
(Dilute)
Red Males

Tortie Females


All kittens carry dilute
Red Males
Cream Males
Tortie Females
Blue Tortie Females

All non dilute kittens carry dilute
Cream Males

Blue Tortie Females
Dams Across

Sires Below
Red Red
(Carrying Dilute)
Cream
(Dilute)
Red Red Males

Red Females
Red Males

Red Females

50% kittens carry dilute
Red Males

Red Females

All kittens carry dilute
Red
(Carrying Dilute)
Red Males

Red Females


50% kittens carry dilute
Red Males
Cream Males
Red Females
Cream Females

50% non dilute kittens carry dilute
Red Males
Cream Males
Red Females
Cream Females

All non dilute kittens carry dilute
Cream
(Dilute)
Red Males

Red Females


All kittens carry dilute
Red Males
Cream Males
Red Females
Cream Females

All non dilute kittens carry dilute
Cream Males

Cream Females
Simple Inheritance
Named after the studies of Gregor Mendel, simple inheritance relates to a trait governed by a single gene.

In cats, the inheritance of black and blue is an example. Genes on the autosomes (the chromosomes other than the X and Y sex chromosomes) are inherited in pairs, one copy from each parent.

If a cat inherits 2 blue genes, it will be blue. If it inherits 2 black genes it will be black. If it inherits 1 black gene and 1 blue gene it will be black but can pass on the blue gene to its offspring.

The black gene is dominant - this gene will always be expressed (show up in the phenotype i.e. outward appearance) even if only 1 copy is present. The blue gene is recessive and will only be expressed if 2 copies are present.

A dominant gene is always expressed even if only one copy is inherited. A recessive gene is only expressed if two copies are inherited.

An animal where both copies of the gene are the same is homozygous for that trait. An animal where the copies are different is heterozygous for that trait.

The blue gene is recessive. It is only expressed if the cat didn't inherit a black gene. Blue cats are homozygous for the blue colour. Its genotype (genetic make-up) is the same as its phenotype unlike a black cat whose genotype can be either heterozygous or homozygous.

By convention, a dominant gene is shown in uppercase and a recessive gene is shown as the same letter, but in lowercase.
You will see from the table below that mating a blue (solid or tabby) cat to a black not carrying dilute (tabby or solid) all the resulting kittens will be black (tabby or solid) and whilst none will be blue they will ALL carry blue (dilute) This is the same for Cream as it is the dilute of Red as Blue is simply the dilute of Black.
Black Homozygous Cat BB
B B
Blue Homozygous Cat bb
b Bb Bb
b Bb Bb
  Black Heterozygous Cat Bb
B b
Black Heterozygous Cat Bb
B BB Bb
b Bb bb
Tabby Patterns also have a dominant and recessive - Mackerel is Dominant and needs only one copy to express in the coat - Classic needs two to express in the coat. All cats carry two tabby patterns - so a Mackerel cat can carry Classic pattern but not the other way around.

Solid works like the dilute gene - you need two copies to be solid but you can have a tabby cat who carries solid.

Silver - the Inhibitor gene is again Dominant and needs a cat to have at least one copy for it to be a silver (or smoke in a solid cat) - because of this a cat cannot carry silver it must be silver to have silver offspring. A cat can however have two copies of the silver gene if both it's parents were silver there is a 25% chance that the cat is Homozygous (carries two copies) and will therefore only have silver offspring no matter what mating is done.

Red is another dominant colour as it influences the non-agouti gene. Non-agouti (solid colour) cats that also have the orange gene will turn out tabby. Even the so-called solid red (red self) cat has tabby markings, even though breeders are working to decrease the contrast between background and marking colours.
    Here you see a table with the mating of a tortie female to a red male.
  Genes from Tortie Female
O (Red) o (Black)
Genes from Red Male
O (red) (X Chromosome) OO (Red Female) Oo (Tortie Female)
No Gene (Y Chromosome) O- (Red Male) o- (Black Male)
    Here you see a table with the mating of a tortie female to a black male.
  Genes from Tortie Female
O (Red) o (Black)
Genes from Black Male
o (black) (X Chromosome) Oo (Tortie Female) oo (Black Female)
No Gene (Y Chromosome) O- (Red Male) o- (Black Male)
Back To Top