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-   -   Homozygous question! (http://www.horseforum.com/horse-colors-genetics/homozygous-question-130061/)

MangoRoX87 07-08-2012 03:25 PM

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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CLaPorte432 07-08-2012 03:31 PM

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I dont 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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NdAppy 07-08-2012 03:51 PM

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. :-)

CLaPorte432 07-08-2012 03:56 PM

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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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Reno Bay 07-08-2012 04:04 PM

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.

NdAppy 07-08-2012 04:10 PM

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.

Reno Bay 07-08-2012 04:35 PM

Like I said...IF being homozygous-dominant isn't lethal...

NdAppy 07-08-2012 04:43 PM

:wink: 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.

Reno Bay 07-08-2012 05:16 PM

That's odd cause your post was 6 minutes after mine. I seem to have a few forum issues XD

NdAppy 07-08-2012 05:55 PM

I had the screen open for a while as I got side tracked with my kids. :-)


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