College of Cat Genetics:
by Patricia Turner
What is meant by the genotype of a cat and how can this differ from
Answer: The genotype of the cat is its recipe
or coded instructions for its voice, temperament, colour, conformation
and all other characteristics. The phenotype of the cat is the total
of characteristics that may be seen, smelt, heard or otherwise identified
by the senses. Thus, a colour genotype is the complex of colour genes
carried on the the chromosomes of a cat and the colour phenotype
is the visible colour of the cat.
If a Blue cat is mated to a homozygous Black cat, will the kittens be
all black, or 50% black and 50% blue?
Answer: If a Blue cat is mated to a homozygous Black cat,
all the kittens will be Black.
What colour gene (present in either a double or a single dose) do the
following cats have in common:
Brown Burmese; Seal Point Siamese; Brown Tabby; Chinchilla?
Answer: The colour gene common to the Brown Burmese, Seal
Point Siamese, Brown Tabby and Chinchilla is Black,
i.e. the Black cat with two genes for Burmese dilution becomes the Brown
the Black cat with two genes for Siamese dilution becomes the Seal Point
the Black cat with one or two genes for agouti becomes
the Brown Tabby and
the Black cat with one or two genes for melanin inhibitor and
one or two genes for agouti becomes the Chinchilla.