Homozygous question!
 
 

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Homozygous question!

This is a discussion on Homozygous question! within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • Homozygous questions

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    07-08-2012, 03:25 PM
  #1
Green Broke
Homozygous question!

Is it possible for a horse to be homozygous for different overo genes? Like splash or the others who's name escapes me? Obviously not frame lol.

Pictures would be nice too:P
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    07-08-2012, 03:31 PM
  #2
Trained
I don't see why not. Although I personally have never seen a homozygous splash or sabino horse.

Sabino, splash and frame are the 3 overo genes.

Frame you know, in its homozygous form is fatal 100% of the time.
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    07-08-2012, 03:51 PM
  #3
Trained
CCH on here owns a horse that is homozygous for splash CLa. I know there are more out there now that we have some splash tests.
     
    07-08-2012, 03:56 PM
  #4
Trained
NDAppy, your right! Do you know if Gunner is homozygous for splash? I believe he is deaf too. Are homozygous splash horses more prone to deafness do you know?

Im sure there are quite a few out there. But I never see anything advertised as "homozygous for the splash/sabino gene" its always for tobiano..
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    07-08-2012, 04:04 PM
  #5
Yearling
If being homozygous-dominant isn't fatal (as is the case with frame overo) then I don't see why horses wouldn't be able to be homozygous-dominant for multiple patterns.

If you bred a SbSb Spsp horse with a Sbsb SpSp horse, you could theoretically come out with any Sb- Sp- foal, including homozygous-dominant for both.
     
    07-08-2012, 04:10 PM
  #6
Trained
I don't believe that there has been much advertising about it yet as the test is still so "new" so to speak.

I believe that the Gunner line is SW2 carriers, and it is beleived that SW2 is embryonic lethal.
     
    07-08-2012, 04:35 PM
  #7
Yearling
Like I said...IF being homozygous-dominant isn't lethal...
     
    07-08-2012, 04:43 PM
  #8
Trained
when I typed out my response your post wasn't there.

SW1 can and is homozygous. SW2 and SW3 are thought at this time to be embryonic lethal.
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    07-08-2012, 05:16 PM
  #9
Yearling
That's odd cause your post was 6 minutes after mine. I seem to have a few forum issues XD
     
    07-08-2012, 05:55 PM
  #10
Trained
I had the screen open for a while as I got side tracked with my kids.
     

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