[nagdu] Chocolate Labs

Tracy Carcione carcione at access.net
Wed Apr 30 11:38:57 UTC 2014


So, breeding 2 yellows begets more yellows, which explains why GDB has so 
many more yellows than other places, or did when I was going there. They 
kept having successful yellows, so they keep breeding successful yellows.
Tracy

----- Original Message ----- 
From: "Ann Edie" <annedie at nycap.rr.com>
To: "'NAGDU Mailing List,the National Association of Guide Dog Users'" 
<nagdu at nfbnet.org>
Sent: Wednesday, April 30, 2014 5:09 AM
Subject: [nagdu] Chocolate Labs


> Hi, All,
>
>
>
> Here is a clip from the article on coat color inheritance in Labrador
> retrievers that I found on Wikkipedia:
>
>
>
> ".a single genetic cross involving two black Labradors each with a 
> recessive
> allele at both the B and the E locus (BbEe) has the potential of producing
> all of the possible colour combinations, while crosses involving chocolate
> dogs can never produce black (there being no dominant B allele in either
> parent) but can give rise to yellow, while yellow Labradors will breed 
> true
> <http://en.wikipedia.org/wiki/Breed_true>  with regard to fur colour.."
>
>
>
> My understanding from reading this article is that more than one gene is
> involved in Lab coloration.  For one of the genes, black is the dominant 
> and
> yellow is recessive.  That is why a breeding between 2 yellow parents
> produces all yellow offspring.  But 2 black parents can both have one
> recessive gene, and therefore, offspring can be of any color.  Two 
> chocolate
> parents can produce both chocolate and yellow pups.  There is another gene
> which causes the range of colors within the yellow; and there is another
> which affects the skin color separately from the coat color.  So it is 
> more
> complicated than just a dominant/recessive situation.  This article 
> doesn't
> even go into the situation where a yellow is bred to a black or chocolate
> colored dog.  But it does state that black, chocolate, and yellow are the 
> 3
> colors of the Labrador retriever which are recognized by the AKC, in other
> words, all 3 colors are one and the same breed, so are not separated in
> temperament or anything else other than color.  As with so many things, I
> think our expectations of what we think the temperament or personality of
> the different colors of individual dogs will be affects our perception of
> those dogs.
>
>
>
> Best,
>
> Ann
>
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