Labrador retrievers are commonly black, brown, or yellow. Two different genes determine coat color in Labrador retrievers.The B gene determines pigment color (B is black, b is brown). The E gene determines whether the pigment can be deposited in the hair shaft: ee prevents any pigment from being deposited, resulting in yellow dogs.You want to breed Labrador retrievers, and you cross a true-breeding brown Labrador retriever to a true-breeding yellow Labrador retriever. All 15 of the F1 puppies are black.After the puppies grow up, you cross two of the F1 black dogs together. In the F2 generation you get 8 black puppies, 4 yellow puppies, and 3 brown puppies.Part 1What is/are the possible genotype(s) of the true-breeding brown lab in the P generation?- ○ bbEE- ○ Brown- ○ bbee- ○ bbEe- ● Could be either answer bbEE or bbEePart 2What is/are the possible genotype(s) of the true-breeding yellow lab in the P generation?- ○ bbee- ○ Bbee- ○ BBee- ○ Could be either bbee or Bbee.- ○ Could be either Bbee or BBee.- ○ All of the genotypes shown are possible.

Answered: Labrador retrievers are commonly black,…

Human Anatomy & Physiology (11th Edition)

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Author:Elaine N. Marieb, Katja N. Hoehn

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Labrador retrievers are commonly black, brown, or yellow. Two different genes determine coat color in Labrador retrievers.

The B gene determines pigment color (B is black, b is brown). The E gene determines whether the pigment can be deposited in the hair shaft: ee prevents any pigment from being deposited, resulting in yellow dogs.

You want to breed Labrador retrievers, and you cross a true-breeding brown Labrador retriever to a true-breeding yellow Labrador retriever. All 15 of the F1 puppies are black.

After the puppies grow up, you cross two of the F1 black dogs together. In the F2 generation you get 8 black puppies, 4 yellow puppies, and 3 brown puppies.

Part 1

What is/are the possible genotype(s) of the true-breeding brown lab in the P generation?

- ○  bbEE
- ○  Brown
- ○  bbee
- ○  bbEe
- ●  Could be either answer bbEE or bbEe

Part 2

What is/are the possible genotype(s) of the true-breeding yellow lab in the P generation?

- ○  bbee
- ○  Bbee
- ○  BBee
- ○  Could be either bbee or Bbee.
- ○  Could be either Bbee or BBee.
- ○  All of the genotypes shown are possible.

Expert Solution

Step 1

Two genes interact to determine coat colour in Labrador retrievers (pigment and deposition of pigment). Epistasis is the term for this.

The colour of the coat can be either black (B) or brown (b), and the pigment is either deposited into the hair shaft (E) or it is not deposited (e). No matter what colour they inherit, retrievers with the genotype __ee will always have a yellow coat (e.g., Bbee or bbee gives a Yellow lab).

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