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Labrador Retrievers

Labrador Retrievers. Fur color in Labrador Retrievers is controlled by two separate genes. Fur color is a polygenic trait! Gene 1: Represented by B : Controls color Gene 2: Represented by E : Controls expression of B. Labrador Retrievers.

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Labrador Retrievers

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  1. Labrador Retrievers • Fur color in Labrador Retrievers is controlled by two separate genes. • Fur color is a polygenic trait! Gene 1: Represented by B : Controls color Gene 2: Represented by E : Controls expression of B

  2. Labrador Retrievers • If a Labrador retriever has a dominant B allele, they will have black fur. • If they have two recessive alleles (bb) they will have brown fur.

  3. Labrador Retrievers • If a retriever receives at least one dominant “E” allele, they will remain the color that the “B” allele coded for. • Either black of brown • However, if a dog receives a pair of homozygous recessive “e” alleles, they will be golden regardless of their “B” alleles!

  4. Labrador Retrievers • BBEE and BbEe --> Black retrievers • bbEE and bbEe --> Brown retrievers • BBee, Bbee, or bbee --> Golden retrievers

  5. Try this cross… • You have decided to cross your golden retriever (bbee) with the neighbor’s chocolate retriever (bbEe). What color pups will they have?

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