Chick with curled wing feathers

The frizzling gene itself is a partial dominant, so typically a parent would have to actually be frizzled in order to make frizzled offspring.

However, there is a recessive 'frizzle modifier' gene, mf, that tones down the appearance of frizzling so that a bird expressing the modifier (mf/mf) and one copy of frizzling (F/f+) looks normal or mostly normal with just a little bit of raising on feathers in some spots. If a bird that is F/f+ mf/mf is bred to a normal bird, f+/f+ Mf+/Mf+ or f+/f+ Mf+/mf, then you'd see some frizzles in the offspring despite the parents not outwardly looking frizzled. That could be what's happening here.
 
Parents do not need to be frizzled because I hatched this one from our chickens, none of whom are frizzled. Their parents were though, so second generation is possible too.
That could be the case because I’ve never seen this chicks “grandparents”
 

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