Ok, looked it up. Frizzle is dominant. Frizzle rooster has one frizz gene and one smooth gene. Breed him to a smooth hen and chances are 50% frizzle, 50% smooth.
If you breed 2 frizzles, chances are 25%smooth, 50% frizzle, 25% frazzle
If you breed 2 frizzles, chances are 25%smooth, 50% frizzle, 25% frazzle