Multiple Allele Traits in Labrador Retrievers

August 22, 2014 – 11:53 am

labradorsName:_______________________________________

The dash (missing allele) indicates that the allele may be dominant or recessive. It will not affect the phenotype.

In labradors, coat color is controlled by two sets of alleles. Black is dominant to brown, but yellow is epistatic, when two yellow alleles are present (ee), the yellow coat color is expressed, independent of the brown/black alleles present.

1. On the cross pictured, what must be the genotypes of the two parents for the outcome to produce at least one yellow labrador puppy but NO chocolate puppies.

BBEe x BBEe

(The parent could also be Bb as long as the other was BB)

2. Show the following cross and describe the phenotypic ratios. A punnett square or a mathematical ratio can be used to solve this.

BbEe x BbEe

9/16 will display the dominant B_E_ (black)

3/16 will be bbE_ (brown)

3/16 will be Bbee (yellow)

1/16 will be bbee (yellow)

Total yellow = 4/16

3. Show the following cross and describe the phenotypic ratios.

BbEe x bbee

1/2 Bb
1/2 bb

1/2 Ee
1/2 ee

Using the multiplicative principle

1/4 BbEe = black
1/4 Bbee = yellow
1/4 bbEe = brown
1/4 bbee = yellow

Add the yellow together 2/4 yellow

4. Show the following cross and describe the phenotypic ratios.

bbEe x bbee

all offspring are bb

1/2 Ee and 1/2 ee

or 1/2 Eebb (brown) and 1/2 bbee (yellow)

5. If a chocolate lab carries a yellow allele, what would be the ratio of the offspring if it is bred with a yellow lab that is heterzygous for the black/brown coat color gene. (Hint: Work out the genotypes of parents first!)

Parent 1: bbEe

Source: www.biologycorner.com


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