Practice Problem 19

Introductory Animal Genetics
Animal Science 221

Phenotypic Ratios

At the agouti locus in dogs, a^y is the allele for yellow and a^t the allele for bicolor. There is codominance for these two alleles such that :

a^ya^y is sable
a^ya^t is a darker sable (dark hairs interspersed)
a^ta^t is bicolor

Hair length is short due to a dominant allele L and long when ll.

What is the phenotypic ratio in progeny from the following matings:

Choose mating:

a^ya^tLl x a^ya^tLl

a^ya^tLl x a^ya^tll

Short hair sable

Short hair dark sable

Short hair bicolor

Long hair sable

Long hair dark sable

Long hair bicolor

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