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I always understood that there is dominate/ recessive and then there is sexlinked which is carried on the X chromosome. making this 2 separate things.
 
I think there was someone who believed there was a chocolate gene that is dominant but I have no knowledge about it. Mine are recessive, that have been proven by the way they breed. They breed true to the rules that recessive chocolate breed by. It is also definitely sex linked. The hens require only one chocolate gene to be chocolate but the roosters require 2 genes to show chocolate. It's very easy to breed for this color, very predictable. All you need to start is a single chocolate rooster and some good black hens.
 
I always understood that there is dominate/ recessive and then there is sexlinked which is carried on the X chromosome. making this 2 separate things.
there is no X chromosome on chickens, only Z and W, boys have ZZ and girls have ZW, but in the case of sex linked chocolate(choc) this gene is also recessive
 

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