Yes, Chris, this is where the E gene comes into play. Most Cavaliers do have 2 black genes. Whether or not they are black is controlled more often at the red gene locus. If they have two red genes then the dog is a black nosed red (either Blenheim or Ruby depending on what the gene pair at the spotting locus is). If they have either two EE genes (the dominant gene at the red locus) or one recessive 'e' and one E gene, then the dog will be black. The confusion is because people think that black and red are at the same gene pair; they are not. Black is at the B gene pair and Red is at the E gene pair. They are inherited independently of each other. The other color that is at the Black gene pair is Chocolate or brown-- and not red.
Here are the alleles for Cavaliers at the Black gene pair: B = Black b = Chocolate or brown The alleles at the Red gene pair are: E = dominant gene necessary for extension of black or brown pigment throughout the coat e = recessive gene that restricts black pigment to eyes and nose. B and E are complimentary genes. Both are necessary to make a dog black. Since Chocolate is extremely rare, it is probable that over 95% of Cavaliers carry two black genes at the B gene pair and their color is determined by how many recessive red genes they carry-- none or one and the dog is black, two red genes and the dog is red. All the best, Susan Cochran ----- Original Message ----- From: "Chris Arden" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 26, 2002 9:14 PM Subject: Re: [CKCS-L] Color Genetics follow up questions > Myra Savant wrote: > > > Chris, a lot depends on whether the whole color is parti-factored or not. > > If the whole color is parti-factored, you could breed the parti-factored > > whole color to a blenheim in an effort to pick up the blenheim gene > > that the > > whole color carries. Some breeder believe that by doing that, you can > > enrich the pigment color on the blenheim puppies. I'm not a good one to > > verify that because my experience is rather limited, but I can tell > > you that > > breeders will often breed a parti-factored whole color to a blenheim. > > Myra > > > Thanks Myra :-) > > So, if I've understood correctly: > > By breeding a Black & Tan that has 1 particolor gene and 1 red gene you > can get richer colored Blenheims but with a high probability of getting > any/all of the other 3 colors too; > they musn't be B&T's with 2 black genes though or you'll only get B&Ts > and Tris. > > And the same applies to Rubies and is simpler I guess since they can > only have two red genes (no black). > > Unless of course this is where what Susan Cochran was saying about E > genes comes into play: I must admit she totally threw me by saying that > in reality 95% of Blenheims have 2 black genes!!! > > Chris > > ========================================================= > "Magic Commands": > to stop receiving mail for awhile, click here and send the email: > mailto:[EMAIL PROTECTED]?body=SET%20CKCS-L%20NOMAIL > to start it up gain click here: > mailto:[EMAIL PROTECTED]?body=SET%20CKCS-L%20MAIL > > E-mail [EMAIL PROTECTED] for assistance. > Search the Archives... http://apple.ease.lsoft.com/archives/ckcs-l.html > > All e-mail sent through CKCS-L is Copyright 2002 by its original author. ========================================================= "Magic Commands": to stop receiving mail for awhile, click here and send the email: mailto:[EMAIL PROTECTED]?body=SET%20CKCS-L%20NOMAIL to start it up gain click here: mailto:[EMAIL PROTECTED]?body=SET%20CKCS-L%20MAIL E-mail [EMAIL PROTECTED] for assistance. Search the Archives... http://apple.ease.lsoft.com/archives/ckcs-l.html All e-mail sent through CKCS-L is Copyright 2002 by its original author.
