Your chart was okay as far as it went, but what about the heterozygotes? These are the dogs that carry a recessive and a dominant at any particular gene locus.
An example would be a B&T that is aaEeSs and can have offspring of all four colors. Most B&T's are aaEeSS however, and produce B&T's and Rubies. A B&T with the genotype aaEESS would be a dominant B&T and these are rare. The most common Tri genotype is aaEess, not aaEEss, and can have Blenheim and Tri offspring. I've only had one Tri with that carried the EE gene pair and was dominant for Tri in my 21 years in Cavaliers. Only the Blenheim is homozygous, well usually, there is an exception that occurs rarely where the Blenheim carries for Chocolate. Most of the time a Blenheim is aaeess. A Ruby can be either aaeeSS or aaeeSs (carries for parti color). Your conclusions are partially true due to not figuring in the heterozygotes. Figure those in and things get a little more conplicated. When you breed a pure or homozygous Ruby to a pure or homozygous Tri, you will get all B&T's. That is because the Ruby is dominant for solid color (SS) and the Tri is dominant for the extension gene (EE). All puppies will be aaEeSs and will be B&T's who carry for red and parti. All the best, Susan Cochran ----- Original Message ----- From: "Susan Jackson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, September 30, 2001 12:55 PM Subject: [CKCS-L] Genetics of Coat Color in CKCS > Hi List, > > I couldn't sleep last night so I got up and spent an hour or so reading > Clarence Little's "The Inheritance of Coat Color in Dogs," trying to > understand the genetics of Cavalier coat colors. I then spent another hour > or so creating a chart and came up with the conclusions listed below. If > any of you are interested in proofing my chart before I put it on my web > site (and, possibly, make a complete fool of myself for overlooking the > obvious) or have had experiences contrary to my conclusions, or know of a > chart already out there, please let me know. > > Conclusions based on the following simplified information: > > B&T = aaEESS; Tri = aaEEss; Ruby = aaeeSS; Blenheim = aaeess > Where a = tan points; E = formation of dark (black or brown over whole > coat); e = no dark pigment, leaving a clear and evenly distributed shade of > red or orange; S = Solid coat color; s = piebald spotting > > 1. Black is dominant over ruby and blenheim > 2. Solid colors are dominant over broken (piebald) colors. > 3. In order to increase the chances of producing Tri-Color, breed Tri to > Tri, Tri to Blenheim or Tri to a B&T that is out of a Tri/B&T mating. > 4. B&T's are dominant over all other colors. Which makes it a easy color > to lose if you don't keep breeding them. > 5. Blenheims are recessive to all other colors. Therefore are the most > common, as almost every dog carries the recessive for blenheim. > 6. Ruby to ruby or to blenheim will produce ruby. > > Now, for those who haven't already gone to sleep, the question I have > difficulty answering is: What do you get when breeding a pure Ruby to a > pure Tri? A very dark ruby? Any answers, genetically or practically > speaking? > > Susan Jackson > Ch Reward's Ropin' the Wind (Windy, 10 yrs young Boxer) > Allegria Gambler's Reward (Keno, 4 mo old Cavalier) > Sylmar, CA > [EMAIL PROTECTED] > > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > > ========================================================= > "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 1999 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 1999 by its original author.
