Educational Charts and Diagrams
The following are educational charts and diagrams that can be saved and freely shared.
All information is based on our published research paper - "Langevin et al" -
Mary Langevin, Helena Synkova, Tereza Jancuskova, Sona Pekova
Published: September 20, 2018
Example of a resulting litter of non-expressing offspring from a dam with a Merle pattern caused by 2 shorter non-expressing Merle alleles.
Example of 15 dogs from various breeds who all express no Merle pattern but when bred to a Merle mate may produce offspring with pigment deleted to white and therefore the risk of vision and/or hearing impairments
Example of an Mc+ dam, thought to be a non-merle and resulting pups of Mc+/M with pigment deleted to white.
Example of an Mh sire, thought to be non-merle and resulting impaired pup with pigment deleted to white.
Example of an Ma+ sire, thought to be a non-merle and resulting Ma+/M impaired pups with pigment deleted to white.
Example of a Great Dane thought to be M + H - Harlequin. Test results show her to be Mh - Harlequin Merle, h/h - Non-Harlequin
Example of 2 "excessive white" dogs - Double Merle and Piebald and resulting litter. M and S locus do not interact with each other.
Paw Print Genetics error in regards to the Mc - Cryptic Merle allele in the "Ballif et al" research paper. Mc does NOT express a minimal merle pattern.
Example of vision and hearing impairments caused by "double merle" - Mh/Mh NOTE this dog is e/e - Recessive Red (Yellow)
Nice example of a homozygous merle female with a shading from the combination of Mc/Ma and all her non-expressing offspring.
Example of "starburst" pupils due to "double merle" - M/M. Also an excellent example of a very noticeable Merle pattern expressing on Ay - Sable due to the merle allele combination. Any combination of merle alleles that are "strong enough" to delete pigment to white are also strong enough to express with a merle pattern. This also includes Mh - Harlequin Merle