No, that is not correct.
Think LP = spots/characteristics, and PATN = white.
An LP LP horse would be homozygous for spots/characteristics, but in the absence of PATN would be solid...
Pretty sure it's the other way around... the reason people breed non characteristic Appy's because they might still have the PATN gene. Of course you'd have to breed them to an Appy that carries the LP gene. My fewspot is LP/LP therefore I'm guarenteed some Appy characteristics in her foals even though I plan to breed her to a Friesian sporthorse without an LP gene.
Ever do invisible notes with lemon juice? Write the note in juice and then after it dries you can't see it. You then place it in front of a lightbulb to heat up and show your note. Well the PATN gene would be the lemon juice. The horse may have the PATN gene but without the LP (lightbulb) it won't show up. Might not be the best analogy but the only one I could come up with right this minute.
NdAppy.. do you agree or am I the one who has it backward?