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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
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 retrievers1
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.
labrador retrievers2
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!
labrador retrievers3
Labrador Retrievers
  • BBEE and BbEe --> Black retrievers
  • bbEE and bbEe --> Brown retrievers
  • BBee, Bbee, or bbee --> Golden retrievers
try this cross
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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