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Answer :
The inheritance pattern in Labrador retrievers is an example of epistasis, where the E and B genes interact to determine fur and nose color. The E gene dictates whether dark pigmentation is present, while the B gene determines the specific shade if dark pigmentation is present. Yellow labs have ee genotypes, which results in a yellow coat, while B_E_ dogs are black and bbE_ dogs are chocolate.
Inheritance Pattern in Labrador Retrievers
The variation in fur color and nose color in Labrador retrievers is an example of epistasis. The color of Labrador retrievers is controlled by two main genes: the E gene and the B gene. The E gene determines whether the dog will have dark pigmentation (E) or no dark pigmentation (e).
The B gene determines the specific shade (black B or brown b) of fur for dogs with dark pigmentation. A dog with the genotype ee will be a yellow lab, regardless of its B alleles, because the ee genotype blocks the expression of the B gene. Therefore, B_E_ dogs have black fur, and bbE_ dogs have chocolate fur.
The nose color in Labrador retrievers is also influenced by these genes. Typically, labs with black fur almost always have black noses. This uniformity is because the black pigment coding influences both the fur and the nose. Although not as rare, labs with yellow fur can have either pink or black noses due to the diverse combination of underlying genetic factors.
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Final answer:
The pattern of inheritance observed in Labrador Retrievers' fur and nose color is an example of epistasis, where the effect of one gene is dependent on the presence of one or more 'modifier genes'. In Labradors, color is determined by two genes, with one gene also affecting nose color.
Explanation:
The inheritance pattern in Labrador Retrievers is likely an example of epistasis. This occurs when the effect of one gene (in this case, the gene controlling the fur color) is dependent on the presence of one or more 'modifier genes' (in this case, the gene controlling nose color).
As explained, the color of a Labrador retriever is determined by two genes: E controls whether the dog's fur is black (B_E_) or chocolate (bbE_), and B further determines if the dog is yellow (_ee_). The nose color, too, is controlled by the B gene. Thus, a Labrador that inherits the dominant allele (B) will have black fur and a black nose, while those with the recessive allele will have yellow fur and a pink nose. This is how can a Labrador with black fur can have a black nose.
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