## Coat Colour Inheritance - Genetics

** Is this hard to understand? Look** at "Inheritance of Coat Colour"** to see the explanation of genetics and passing on coat colour traits. As you can see from the Chocolate Genetics page, there are only **

*two*combinations of genes that will result in a Chocolate dog. This makes Chocolate the rarest of the labrador colours, although they could be as common as yellow (only three combinations) if they were specifically bred for. In contrast there are four combinations of genes to get a black dog.

**All Pairings that will give Chocolate Coat Colour -**

**Chocolate to Black Pairings**

**bbEE x BbEE will give the probability of 1/2 chocolate & 1/2 black.**

bbEE x BbEe will give the probability of 1/2 chocolate & 1/2 black.

bbEe x BbEE will give the probability of 1/2 chocolate & 1/2 black.

bbEe x BbEe will give the probability of 3/8 chocolate, 1/4 yellow, 3/8 black (a rainbow litter).

bbEE x BbEe will give the probability of 1/2 chocolate & 1/2 black.

bbEe x BbEE will give the probability of 1/2 chocolate & 1/2 black.

bbEe x BbEe will give the probability of 3/8 chocolate, 1/4 yellow, 3/8 black (a rainbow litter).

**Black to Black Pairings**

**How do two black dogs produce chocolate puppies? Both must be carrying a chocolate gene.**

BbEE x BbEE will give the probability of 1/4 chocolate.

BbEE x BbEe will give the probability of 1/4 chocolate.

BbEe x BbEe will give the probability of 3/16 chocolate, 4/16 yellow, 9/16 black (a rainbow litter).

BbEE x BbEE will give the probability of 1/4 chocolate.

BbEE x BbEe will give the probability of 1/4 chocolate.

BbEe x BbEe will give the probability of 3/16 chocolate, 4/16 yellow, 9/16 black (a rainbow litter).

**Yellow to Black Pairings**

**Bbee x BbEE will give the probability of 1/4 chocolate & 3/4 black.**

Bbee x BbEe will give the probability of 1/8 chocolate & 3/8 black & 1/2 Yellow (a rainbow litter).

bbee x BbEE will give the probability of 1/2 chocolate & 1/2 black.

bbee x BbEe will give the probability of 1/4 chocolate, 1/2 yellow, 1/4 black (a rainbow litter).

Bbee x BbEe will give the probability of 1/8 chocolate & 3/8 black & 1/2 Yellow (a rainbow litter).

bbee x BbEE will give the probability of 1/2 chocolate & 1/2 black.

bbee x BbEe will give the probability of 1/4 chocolate, 1/2 yellow, 1/4 black (a rainbow litter).

**Chocolate to Chocolate Pairings**

**bbEE x bbEE will give 100% chocolate puppies.**

bbEE x bbEe will give 100% chocolate puppies. One half will carry yellow.

bbEe x bbEe will give the probability of 3/4 chocolate pups, and 1/4 pale yellow pups.

bbEE x bbEe will give 100% chocolate puppies. One half will carry yellow.

bbEe x bbEe will give the probability of 3/4 chocolate pups, and 1/4 pale yellow pups.

**Chocolate to Yellow Pairings**

**bbEE x Bbee will give the probability of 1/2 chocolate & 1/2 black.**

bbEE x bbee will give 100% chocolate, all will carry yellow.

bbEe x Bbee will give the probability of 1/4 chocolate, 1/2 yellow, 1/4 black (a rainbow litter).

bbEe x bbee will give the probability of 1/2 chocolate, 1/2 yellow with a brown nose.

bbEE x bbee will give 100% chocolate, all will carry yellow.

bbEe x Bbee will give the probability of 1/4 chocolate, 1/2 yellow, 1/4 black (a rainbow litter).

bbEe x bbee will give the probability of 1/2 chocolate, 1/2 yellow with a brown nose.

**(Yellow to Yellow will only ever produce yellow.)**