Myra, albinism is not the only simple recessive trait. There are many simple recessive traits which are affected by other genes which the animal carries. This is called epistasis. One of such simple recessive trait is the chocolate color in Cavaliers. The dog can have two genes for chocolate and still not be a visual chocolate color. This happens when the dog also carries two genes for red. In that case, the dog is a Blenheim or Ruby even though it has both genes for chocolate. Not all simple recessives are as powerful as albinism or red when carried as a pair.
BTW there is an albino that has brown or hazel eyes and red or blond hair in humans. There is also an albino in horses that is brown eyed. Just because the organism has two albino genes doesn't mean that it will always be a ruby-eyed white. It depends on what kind of albino gene it carries and, in some cases, what other genes it carries. Genetics is a vast subject and much more involved than a study of Mendelian principles would lead us to believe. It is like comparing the alphabet to world literature. Mendelian principles are just a starting point. All the best, Susan Cochran ----- Original Message ----- From: "Myra Savant" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, May 10, 2002 8:08 PM Subject: Re: [CKCS-L] Rough coat > Susan, many years ago when I took my first college level class on genetics, > we raised mice and tracked the recessive trait for albinoism. Trust me, no > matter what we would have fed them, where they slept, or what kinds of > environmental insults we might have hurled at them....if they inherited the > recessive gene for albinoism from each parent, they were albinos. Granted, > things have changed significantly in the scientific community since the > early 60s, but not to that extent. What simple recessive trait can be > affected by other factors? Myra > > > >From: Susan Cochran <[EMAIL PROTECTED]> > >Reply-To: The Cavalier King Charles Spaniel List > ><[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] > >Subject: Re: [CKCS-L] Rough coat > >Date: Fri, 10 May 2002 20:11:45 -0400 > > > >Myra, simple recessives can have mitigating factors as well. It doesn't > >have > >to be polygenetic to vary in expression of the defect. > >All the best, > >Susan Cochran > > > > > >----- Original Message ----- > >From: "Myra Savant" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >Sent: Friday, May 10, 2002 7:16 PM > >Subject: Re: [CKCS-L] Rough coat > > > > > > > If you are talking polygenetic traits, this may well be the case. > >However, > > > if you are talking simple recessives, there would not be mitigating > >factors. > > > You either inherit a recessive gene from each parent and express the > >trait > > > or you don't. So...what is the consensus? Polygenetic, or simple > > > recessive? These are apples and oranges. Myra > > > > > > _________________________________________________________________ > > > Chat with friends online, try MSN Messenger: http://messenger.msn.com > > > > > > ========================================================= > > > "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. > > > > > Myra Savant Gardengate Cavaliers > > > _________________________________________________________________ > MSN Photos is the easiest way to share and print your photos: > http://photos.msn.com/support/worldwide.aspx > > ========================================================= > "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.
