I too vote female
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I have American Dominiques and American Dominiques. The former can squabble to an extreme yet the appearance of the comb is seldom changed. Dominiques are no more capable, Differences as depicted in images above are usually visible at hatch or while birds are still in the brooder well before real battles are fought. The environment that I think may be more important is during embryonic development while in the egg.
I have half a dozen juveniles that have a comb like bird #3. That was apparent at hatch and is the reason they are to be culled. The appearance was set while in the egg but how it is inherited still eludes me.