For example, in the coat color of Labrador Retrievers, the gene for pigment production (B) is epistatic to the gene for pigment distribution (E). The presence of a dominant allele (B) results in black pigment, regardless of the alleles at the second locus (EE or Ee).

The three recognised colours of Labrador Retriever (top to bottom): chocolate, black and yellow. The genetic basis of coat colour in the Labrador Retriever has been found to depend on several distinct genes. The interplay among these genes is used as an example of epistasis.

4 天之前 · Recessive masking epistasis can be observed in the coat color of Labrador Retrievers. There are three possible genotypes that result in different coat colors: B_E_ is a black Lab bbE_ is a brown Lab _ _ ee is a yellow Lab

"The Labrador Retriever coat colors are black, yellow and chocolate. Any other color or a combination of colors is a disqualification. A small white spot on the chest is permissible, but not desirable."

2025年2月18日 · Unlock the secrets behind Labrador coat color genetics! Whether you're a breeder, pet owner, or simply a Labrador enthusiast, understanding how black, chocolate, and yellow coats are inherited can be both fascinating and practical. ... We'll also explore the unique role of recessive epistasis—the genetic phenomenon responsible for yellow ...

2023年6月20日 · Figure 6.2.5 6.2. 5: Labrador Retrievers with different coat colors: (from left to right) black, chocolate, yellow: an example of recessive epistasis. (Flickr-John Curley/PhilRomans/Miss Chien-CC:AND)

2019年4月23日 · Labrador retrievers have 3 genetically-determined basic coat colors: yellow, black, and chocolate. This guide explains the genetics behind these coat colors.

4 天之前 · A good example of epistasis is coat color in the popular dog breed the Labrador retriever. Labrador retriever coat color genes only come in black or chocolate. But you see yellow Labrador retrievers running around the dog park.

Epistasis. Dogs don’t have either the TYRP1 gene or the MC1R gene – they have both. In fact, every dog will have two copies of the TYRP1 gene and two copies of the MC1R gene. Since both genes control aspects of coat color, it makes sense that they interact.

Multiple Allele Traits (Epistasis) in Labrador Retrievers. In labradors, coat color is controlled by two sets of alleles. Black is dominant to brown, but yellow is epistatic, when two yellow alleles are present (ee), the yellow coat color is expressed, independent of the brown/black alleles present.