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Sable Merle genetics

Lisa: Hello, I have a question concerning the genetics of sable merle collies and matings. As far as I knew, the color is marked by two alleles, for example sab/sab = pure sable, sab/tri = darksable, tri/tri = tricolour and tri/mrl = blue merle. Now, as it goes, a sable merle would be sab/mrl, right? How can it be then, that tricolour puppies are born in a combination of sab/mrl and tri/tri? From my calculation the puppies must then be either tri/sab (darksable) or tri/mrl (blue merle). Are there different alleles for tri-merle and sable-merle? Or did I simply miss something here? I am studying biology and we are learning all that stuff about genetics, still I can not find a soloution for this problem. Maybe some of the breeders from america can help me solve this riddle. Thanks a lot in advance!

Ответов - 4

Jencolcollies: This link might explain: http://www.taliesencollies.com/Collie_Parent_Progeny_Color_Chart.html Jenny

Nina: Hi, two basic pairs of genes control Collie colors (simplified of course ;)) One of them determines if the dog is sable or tricolor... SS = sable St = sable (dark?) tt = tricolor The other pair controls merle. Merle is not really a color, it's a pattern. Blue-merle dog is actually a tricolor dog with merle pattern. Sable dog with merle pattern would be sable-merle. Something like this... SS mm = sable SS Mm = sable-merle St mm = sable St Mm = sable-merle tt mm = tricolor tt Mm = blue-merle Sable-merle x tricolor genotype could be... St Mm x tt mm ... both parents carry the "t" gene (tricolor) and "m" (non-merle)... so it's possible to get a tt mm - tricolor - puppy.

Lisa: Thank you! Nina, this is what I meant with two different gene-pairs - so it is all cleared up now Thanks again for your quick help

Alertness: Very nice explanation by Nina

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