I have Toppies and yes the top knot is dominant, I have used mine in crosses to hatch hens and have come out with a majority of top knoted chicks, the topknot is not as prominent in the offspring and in some it is not there but it will come out somewhere down the line if you breed to one with it in the bloodline. I have mostly Blue lines in my Toppies with some Spangled and I have some pure White Muffed Toppies. The Muff and Top knot are dominant but not always present in the offspring. Lynn in Okla.
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From what I have seen of the toppy gene (which isn't much) it is dominant. It won't be as prominent as a pure toppy, but it will have a topknot. If you're worried about it, you could always separate the two hens and swap the rooster back and forth over them, mark the eggs(if using a incubator), then mark the chicks?

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From what I have seen of the toppy gene (which isn't much) it is dominant. It won't be as prominent as a pure toppy, but it will have a topknot. If you're worried about it, you could always separate the two hens and swap the rooster back and forth over them, mark the eggs(if using a incubator), then mark the chicks?