Practice Problem 27

Introductory Animal Genetics
Animal Science 221

Joint Probability: 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.

Fill in the expected probabilities for each of the matings and phenotypes. Answers should be rounded to the nearest hundreth.

Choose mating:

a^ya^tLl x a^ya^tLl

a^ya^tLl x a^ta^tll

Select Phenotype:

Short hair sable
Short hair dark sable
Short hair bicolor
Long hair sable
Long hair dark sable
Long hair bicolor

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