How is a new shade isabella and tan merle French Bulldog created?

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Accepted Answer

A New Shade Isabella and tan merle French Bulldog exhibits a unique and rare coat color resulting from specific genetic combinations. This distinctive appearance is achieved by combining the Isabella (lilac) coloration with the merle pattern and tan points.

Genetic Components:

1. Isabella (Lilac) Coloration: This color arises from the presence of two copies of both the dilute gene (d/d) and the testable chocolate gene (b/b). The dilution gene lightens the black pigment to a blue-gray shade, while the chocolate gene further modifies this to a pale brown or lilac hue. 

2. Merle Pattern: The merle gene (M) creates a mottled or patchy coat by causing random dilution of the base color. A French Bulldog must carry one copy of the merle gene (M/m) to display this pattern. Breeding two merle carriers (M/m x M/m) is generally avoided due to health risks associated with double merle offspring. 

3. Tan Points: These markings result from the at allele at the Agouti locus (A). A dog with the genotype at/at will express tan points, typically appearing above the eyes, on the cheeks, chest, and legs. 

Breeding Considerations:

To produce a New Shade Isabella and tan merle French Bulldog, breeders must ensure the following genetic combinations:
- Two copies of the dilute gene (d/d)

- Two copies of the testable chocolate gene (b/b)

- One copy of the merle gene (M/m)

- Two copies of the at allele for tan points (at/at)

It's crucial to conduct comprehensive genetic testing before breeding to confirm these genotypes and to avoid pairing two merle carriers, thereby preventing potential health issues in the offspring.

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