In barkers, the dominant allele D causes a solid coat color; the recessive allel

ID: 101488 • Letter: I

Question

In barkers, the dominant allele D causes a solid coat color; the recessive allele d results in white spots

on a colored background. The black coat color allele L is dominant to the brown allele l, but these genes

are expressed only in the genotype e/e. Individuals that are E/_ are yellow regardless of L alleles. The

three genes are unlinked. A solid yellow male mates with a solid brown female. Their offspring are

comprised of 3 solid black, 2 solid brown, 1 spotted yellow, and 1 spotted black barkers.

PLEASE ANSWER ALL QUESTIONS:

A) What are the genotypes of each of the parents?

B) Describe the relationship between genes E and L.

C) What is the probability that the next pup will be spotted brown?

A. The genotypes of the parents are:

Male - DdEeLl

Female - Ddeell

Dd - as the offsprings have both solid and spotted members

Ll for male - as offsprings consist of both black and brown members

B. The genes E and L are examples of polygenic inheritance, as multiple genes are controlling a single trait

C. 1/4 x 1/4 x 1/4 = 1/64 chances

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