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Hello JamesTRD,
I am probably the worst person to try and explain genetics. I can talk in circles for days and get nowhere. Biology (marine) was my focus in college so applying that same knowledge to dog coat color genetics the basics make sense to me. Of course that doesnt mean I am any good at trying to explain it. In regard to the blue color in Thai Ridgebacks and most other "blue" dogs it never matters how many generations they have been blue or what color their parents are: blues are "pure" for blue. blue is recessive and always requires 2 copies (d+d=blue, D+d is never blue). if a dog had a D instead of a d it could not be blue. that is why we have red and black dogs that can unknowingly be carriers of d(they are Dd) but never a blue dog carrying D (blues always have to be dd).
so now I am going to repeat myself and maybe it probably wont make sense this way either!? :
all alleles come in pairs - a parent animal can only pass on 1 ( dna helix splits ). offspring get 1 allele from each parent to make their own pairs. the blue allele ( d ) in dogs is recessive so in order to be represented in the phenotype (what we see) there has to be 2 d alleles present. a pup needs to get 1 from each parent otherwise it will not be blue ( note anytime i say blue im talking about blue or blue fawn - aka issabella ). all blue Thai Ridgebacks are homozygous(pure) for the blue color - it makes no difference how many generations or what colors are present in their background or even what color the parents were. for example if you got a blue out of a red and black pair that pup would still be "pure" for blue ( homozygous-dd- 2 copies of the same allele, not hetero-2 different alleles which would be Dd-in this case the dog could not be blue since we must have 2 copies of d, remember?) when breeding 2 blues we can only get blue because each of the parents can only give a d to their offspring. dont forget issabella is blue fawn.
has anyone ever had or know of a blue pairing that has produced a color other than blue or blue fawn?
so all ive done is prove that i give bad explanations... but if anyone is interested just do a google search for canine coat color genetics. there are many sites with all the information. dont forget it doesnt need to be Thai Ridgeback specific, in fact i dont think there is any coat color genetics information just for Thai Ridgebacks( that color breeding chart does not count- it's not based on any genetic principles). canine coat color genetics applies to all dogs- though not all color variations apply to all the dog breeds (we dont have any merles or dudley nose dogs, etc. in the Thai Ridgeback ).
James ... www.ManapeThaiRidgeback.com |
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