2. Coat color in Labrador Retrievers is due to the interaction of two alleles. T
ID: 9857 • Letter: 2
Question
2. Coat color in Labrador Retrievers is due to the interaction of two alleles. The E allele determines whether dark pigment will be deposited in the fur or not. If a dog has the genotype ee, no pigment will be deposited in the fur, and it will be yellow. If a dog has the genotype (E_), pigment will be deposited in the fur. A second allele, B, determines how dark the pigment will be. Dogs with the genotype E_bb will have brown fur and are called chocolate labs. Dogs with the genotype E_B_ will have black fur. Dogs homozygous recessive for the E allele have yellow coat color. A chocolate lab, heterozygous for the E allele, and a yellow lab, heterozygous for the B allele are mated. What color puppies will be produced and what are their probabilities?
Explanation / Answer
Parental genotypes: Chocolate lab: Eebb. Yellow lab: eeBb
Create a punnet square with this information. I placed the chocolate lab on top, and the yellow on the left
When you tally them up you are left with:
yellow
Your probability for each is just the number you get divided by the total, so for brown puppies it will be 2/16=12.5% Remember for the yellow puppies to add both allelle sets up to get the correct probability.
Eb Eb eb eb eB EeBb EeBb eeBb eeBb eB EeBb EeBb eeBb eeBb eb EeBb Eebb eebb eebb eb EeBb Eebb eebb eebbRelated Questions
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