The reason that genetic traits that breeders are selecting FOR are not completely consistent across a breed is that, for the most part, breeders are selecting for "expressed" or visible qualities without knowledge of the recessive qualities that are carried by the dog. The reason that doubling up on the recessive genes is so dangerous is because the dog then only carries for that quality, much in the same way that blue eyed people can only pass the gene for blue eyes. As far as the old time breeders who were doing the job right......Yeah. And proof of that is the fact that pure bred dogs have so many genetic diseases. With the knowledge of genetics and disease processes that is available to breeders today, they should be able to start the work of breeding healthier dogs. Myra Savant
>From: Myra Savant <[EMAIL PROTECTED]> >Reply-To: The Cavalier King Charles Spaniel List ><[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: Re: [CKCS-L] more on genetic diversity >Date: Tue, 29 Jan 2002 03:42:32 +0000 > >Actually, a small gene pool becomes an almost unfathomable problem if every >dog is a carrier for the same autosomal recessive trait. Dominant traits >are visible, or expressed, but recessives are hidden with no known tests to >detect them. In-breeding is a good way to double up on the autosomal >recessives and create some really large problems in a hurry. Remember the >laws that forbade sisters and brothers and first cousins from getting >married in a lot of countries? It is the status of the autosomal recessive >traits that created, to some degree, the need for those laws. Myra Savant > > >>From: Peggy Mickelson <[EMAIL PROTECTED]> >>Reply-To: The Cavalier King Charles Spaniel List >><[EMAIL PROTECTED]> >>To: [EMAIL PROTECTED] >>Subject: [CKCS-L] more on genetic diversity >>Date: Mon, 28 Jan 2002 21:33:15 -0500 >> >> > No breeding philosophy is any better or worse than the person >>practicing >> > it. No matter whether you outcross, inbreed or do a little of both, if >> > you don't know what you're doing, and you don't know how to select from >> > what you produce, you will never be successful for longer than can be >> > accounted for by sheer luck. >> > A small gene pool is only a problem if every single dog in the breed >>has, >> > and is "pure for," the exact same genetic problem. >> > I'm not sure this is even possible, much less if it has ever happened >>in >> > a breed. Even genetic traits that breeders are selecting FOR are not >> > completely consistent across a breed. >> > Some breeds have been around for a VERY long time and have gone thru >> > bottlenecks and not had much of a gene pool, yet the breed keeps >>trucking >> > along. >> >>========================================================= >>"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. > > > > >_________________________________________________________________ >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. _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.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.
