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Understanding Labrador Retriever Fur Color Genetics

The fur color in Labrador Retrievers is determined by two separate genes, making it a polygenic trait. The first gene, represented by "B," controls color, while the second gene, represented by "E," dictates the expression of the "B" allele. Dominant "B" leads to black fur, while recessive "bb" results in brown fur. A dominant "E" allele maintains the color determined by "B." However, two recessive "e" alleles produce golden retrievers regardless of the "B" alleles. This guide helps you understand and predict the fur color of resulting puppies from a cross between a golden and a chocolate retriever.

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Understanding Labrador Retriever Fur Color Genetics

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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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