(Sorry for double post I accidentally hit post >.<)
From what I understand no matter what you have to have at least one copy of the Leopard gene (lp) to show other patterns (patn & patn-1) The amount of white is determined by the combination of all three genes, but we currently have no test for (patn) or (patn-1).
(lp) - is the Appaloosa spotting allele, it basically turns on the visual effect of the pattern genes.
(patn) - is thought to show snowcap
or white blanket
(patn-1) - is though to show high white patterns
. It may also cause medium white when heterozygous (PATN-1patn-1) and high white when homozygous (PATN-1PATN-1). Ie. When heterozygous it could cause an extensive blanket
, but when homozygous could cause few spot
Other appy modifiers said to be different alleles are:
(sd) - thought to show the Appaloosa dark spots
that show on on some blankets and leopards.
(sv) - thought to dictate varnish roaning. It's also thought that this is a Semi-dominant gene meaning: horses homozygous
for the allele become lighter than heterozygous horses
(sn) - thought to cause Appaloosa white spots or also called lace blanket, frosted hips, or snowflake.
So now considering your mare (the one on your profile) and stallion (found him on google) I'd initially assume the following:
Patn-1patn-1 or PATN-1patn-1 (just because of her extensive roaning and to cover anything possible)
Svsv or SvSv (because of her extensive roan)
I beleive that would be the studs makeup considering only one of his foals
pictured had a blanket so far (though the other two could sprout one 8 years from now, It's entirely possible their pattern may come in later in life)
So possible outcomes could include
LpLp or Lplp or lplp
PATNpatn or patnpatn
PATN-1patn-1 or patn-1patn-1
Svsv or svsv
Assuming the theory on varnish is true if your horse has either of the first two Lp you may very well get another Varnish. Other possibilities are Varnish Roan Blanket, Extensive Blanket w/wo Varnish, Solid. It's kind of hard to say since we don't really understand appy yet.