Reference no: EM132591136

There are two genes that determine the coat colour expression in dogs: eumelanin and merle. These genes are located on two separate chromosomes.

For the eumelanin gene, black coat colour (E) is dominant over red coat colour (e).

The merle gene controls the degree to which these coat colours are expressed through incomplete dominance.

The following table describes the merle gene expression.

GenotypePhenotype

MM White

Mm Half colour (Grey or light red)

mm Full colour (Black or Red)

A grey dog that is heterozygous for the eumelanin gene mates with a light red dog.

What is the probability they would have a grey puppy?

Select one:

a. 0.25

b. 0.13

c. 0.38

d. 0.50

Two dogs heterozygous for both traits were crossed. What phenotypic ratio is expected in the F1 generation?

Answer

Phenotype:

White

Grey

Black

Light

Red

Red