How does the B-locus interact with other patterns? The B-locus (specifically the TYRP1 gene) determines whether a dog will have a standard black base or a brown (chocolate) base. Because the recessive chocolate allele (b) alters the dog’s dark pigment (eumelanin) from black to a red or brown color, it interacts with and impacts all […]
Can Chocolate Great Danes Have Masks?
Can a chocolate Great Dane also have a mask? Yes, a chocolate Great Dane can have a mask. The chocolate base coat, determined by the B-locus (the TYRP1 gene), can interact with and affect all other coat colors and patterns. According to the Great Dane Rescue, if the recessive chocolate gene (b) is present, it […]
Understanding Red Merle Great Danes and the B-Locus
How does the B-locus create ‘red merle’ Great Danes? The B-locus (specifically the TYRP1 gene) creates a “red merle” Great Dane by altering the color of the dog’s dark pigment (eumelanin) from black to a red or brown color. Because the brown/chocolate allele (b) is a simple recessive trait, a dog must inherit two copies […]
Understanding A and K Loci Interactions in Canine Genetics
How do the A and K loci interact to show patterns? The interaction between the A-locus (ASIP gene) and the K-locus (CBD103 gene or Beta-Defensin 103) is based on a strict genetic hierarchy. Specifically, the K-locus acts as a gatekeeper that determines whether coat patterns coded by the A-locus will actually be visible on the […]
Can Black Great Danes Have Harlequin Puppies?
Can a solid black dog produce harlequin puppies? Yes, a solid black Great Dane can produce harlequin puppies. This is possible because the Harlequin gene acts as a modifier that is only visibly expressed when the dog also possesses the Merle gene. If a dog inherits the Harlequin gene but completely lacks the Merle gene, […]
Understanding Dominant vs Recessive Black Genes in Dogs
What is the difference between dominant and recessive black genes? The difference between dominant and recessive black genes comes down to their location in the dog’s DNA, how they are inherited, and whether they actually exist in the Great Dane breed. Dominant Black (K B ) • Genetic Location: The dominant black gene is located […]
Impact of the D Gene on Fawn and Brindle Great Danes
How does the D gene affect fawn and brindle Danes? The D gene (also known as the D-series or MLPH gene) controls color dilution by lightening a dog’s dark pigment (eumelanin) to blue, which is a greyish color. A dog must inherit two copies of the recessive dilute allele (d/d) for this dilution to be […]
Breeding Chocolate Great Danes: Understanding the B-Locus
How do breeders use the B-locus for chocolate colors? The B-locus (specifically the TYRP1 gene) determines whether a Great Dane will have a standard black base coat or a brown (chocolate) base coat. Here is how breeders use the B-locus to understand and produce chocolate colors: • Understanding the Recessive Trait: The chocolate gene (b) […]
Breeding Genetics: Preventing Double Merles Effectively
How do breeders use genetics to avoid double merles? Breeders use an understanding of genetics and modern DNA testing to carefully plan litters and avoid producing double merles (MM), which are at a high risk for severe vision and hearing impairments. Here is how breeders apply genetic principles to prevent double merles: 1. Recognizing That […]
Understanding Merle vs. Harlequin Merle Dogs
What is the difference between Merle and Harlequin Merle? The difference between a standard Merle and a Harlequin Merle comes down to the length of the genetic insertion at the Merle gene locus (SILV or PMEL17). • Standard (or Classic) Merle: Dogs with a normal merle pattern have an insertion length of 78 to 86 […]