Australian Shepherd Genetics
There are two basic coat colors of the Aussie - red
The base color of the Blue Merle is black and the base
color of the Red Merle is red.
Genetically speaking, the blue merle is a black dog with a merle
gene and the red merle is a red dog with a merle gene.
The two coat
patterns of the Australian Shepherd are merle & solid.
Black is the Dominant color gene; Red is the Recessive color gene.
This means that if both the recessive gene and the dominant gene is present, the color Black will dominate - the red will be hidden.
The genes of the RED dog are denoted as rr
The genes of the BLACK dog are denoted as BB
The genes of a Black red factored dog are Br or rB
r = recessive B = dominant
For an Aussie to be Red, it must carry two red genes because the
color is recessive.
The Mendel's Charts are
representations of the color possibilities of breeding the various
When you bred two animals, the resulting baby
will inherit one gene from each parent for each characteristic
All resulting pups from the RED x BLACK cross
= BLACK (red factored)
All resulting pups from the BLACK x BLACK cross
Resulting pups from the RED x BLACK (red factored) cross = 50% chance resulting pups = BLACK
50% chance resulting pups = RED
ALL pups that aren't RED = Red Factored
Resulting pups from the BLACK x BLACK (both red factored) cross =
75% chance resulting pups = BLACK
25% chance resulting pups = Red
Only the rB pups = Red Factored
ALL resulting pups from the RED x RED cross = RED