Listed here are some of the Genes that are being researched,
that may influence the Koolie.
Of all the characters in the dog, coat color inheritance is among
the best understood. It is, however, complex and involves at least ten
genes, some of which are multi-allelic (occur in more than two
alleles, or forms). There is some disagreement about the multi-allelic
genes but, over all, most are clearly defined and undisputed.
B: This gene has two
B - dominant black. This allele allows black to be expressed (wherever
expected) and always gives a black nose.
b - recessive, inhibited-black. This allele results in chocolate brown
(wherever expected) and always gives a brown or liver nose.
DILUTION: This gene
has two alleles.
D - results in normal pigment.
d - diluted pigment; that is, changes black into blue, or chocolate
MERLE: This gene has
M - merle, having basic color blotched with darker color (black or
m - normal color.
breeds where M occurs, the Mm dog is merle in color. MM is a
semi-lethal combination. MM dogs will be predominantly white, blind
and weak in constitution.
word "merle" was used to describe "marbled (mottled, ticked, flecked)"
ALBINO: This gene
has four alleles.
C - dominant for the production of pigment (melanin). Also called "coloured".
cch - chinchilla or partial albinism.
cd - white coat with dark eyes and nose.
ca - albino, with no pigment, white coat, pink nose and
skin, pink or blue eyes.