Question about pinto genetics - The Horse Forum
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post #1 of 23 Old 10-19-2013, 12:35 AM Thread Starter
Green Broke
 
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Question about pinto genetics

How many different patterns can a horse inherit? For instance, I've heard some described as having frame, splash, & sabino for example. Can't they only carry 2 pattern genes? Can 1 gene produce more than 1 pattern?

I have a gelding homozygous for tobiano, dna tested and while he was still a stallion he sired 4 spotted foals out of solid mares, but I would guess based on what I've learned here that he has more patterns than just tobi, but if that's the case how could he be homozygous?

Pics so you can see what I'm talking about.

Thunder





Sorry I can't find a good picture of his left side on the computer. One of these days I gotta learn how to scan There'll be another one you can see a little better on his foal pictures.



Some of his offspring:
Cloud





TJ





Flash-full brother to TJ



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post #2 of 23 Old 10-19-2013, 01:04 AM
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I think it is important to go back to basics here. You are right in that genes come in pairs, and you can only have two in each pair. Genes are found in pairs on a locus (plural loci). So each LOCUS has a pair of genes. Many of the white pattern genes are found at different loci, which means that they inherit separately to each other. A few share a loci, but they are the exception rather than the rule - eg Tobiano and Dominant White are both on the same loci.
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post #3 of 23 Old 10-19-2013, 12:52 PM
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^^^^ this

Tobiano, splash, frame, sabino, black, cream, agouti, etc are each on their own loci. Each parent will pass a gene from each loci, so a horse can carry multiple patterns, and could, in theory, be homozygous for all of them.
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post #4 of 23 Old 10-19-2013, 02:51 PM Thread Starter
Green Broke
 
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Thanks! Your explanations unfogged my brain a little. The color/pattern genes were just starting to be isolated back when we were raising paints and once we stopped I became lazy about keeping up with the info as it became available.
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post #5 of 23 Old 10-19-2013, 06:14 PM
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Just a minor edit on what I wrote ;). I said that a horse could be homozygous for all of those genes listed, but homozygous frame is lethal... So all the rest of them at least ;)
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post #6 of 23 Old 10-19-2013, 10:18 PM Thread Starter
Green Broke
 
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I actually knew that one Tryst. (: It's amazing how fast the science of genetics is progressing. Now I just have to get brown vs. bay down. Can you see enough of the mare with the black/white filly to tell? I have no clear pictures of her on my computer unfortunately. When bred to a sorrel stallion she has produced a bay and a black. Her pedigree so you can see some of the colors in her background. It doesn't have her dam's color on allbreed but she was black according to APHA's pedigree.

Skip The Tin Paint

Far left in her summer coat...again not a good picture in order to see her entire body.

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post #7 of 23 Old 10-19-2013, 10:20 PM
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The mare with the filly cloud is a BAB (bad ass brown).
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post #8 of 23 Old 10-19-2013, 11:17 PM Thread Starter
Green Broke
 
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Thanks NdAppy! So...genetically speaking a brown would pass along black just like a bay would?

And just a coincidental fact, that mare was bred and born in your state of North Dakota.LOL
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post #9 of 23 Old 10-19-2013, 11:19 PM
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Brown, bay and wild bay are all modifications of the agouti gene.

That's cool!
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post #10 of 23 Old 10-19-2013, 11:50 PM
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those painted horses are beautiful....they always remind me of horses from the old cowboy and indian movies.....and the Indians always seemed to ride the more beautiful painted horses....and the cowboys had the solid colored horses
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