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I am going to take a stab at it and say no -if by throwback you mean grandsire has gene A, sire does not have gene A, and then foal does have gene A. Let us use dun for example. Foal is dun, sire and dam are bay, and of the grandparents there are three bays and one dun. One of a few possible scenarios have occurred - most likely is one parent is misregistered and is actually dun, or someone jumped a fence. Most genes are not missing for a few generations and then randomly pop out. With patterns you can get horses so minimally marked that sometimes they do not appear to express the gene. An example could be a minimal marked overo/frame. In that case you could get a few generations that have the gene but do not express it well and look mostly solid, but then a loudly patterned foal pops out. The gene was always there just not obvious. Since you said pattern I am guessing this may be the case with yours. If someone else could weigh in - I am sure someone else knows more and could explain it better.

Alright. That is what i was wondering. I have some foals from Dancer that are tobis but no white factor. They can still pass loud tobis even though they dont carry the white factor correct?

http://hj2.huntandjump.com/horse.php?horseid=611315

That is one of his sons. That is tobi but no white.

Nice Rose. I am still learning. I still havent gotten the hang of what goes with what to make certain colors.

Also that colt is gorgeous