Search results for query: *

Probably so.

That makes sense. The Blue Copper Marans has one B/B/S gene so some get it and are blue and some don't get it and are black. You probably know all this. With the hen being barred and the rooster not barred the chicks will be sex linked with the boys having the spot. The question is how well...

If the BCM were carrying Blue genes he would be blue or splash, not black. My guess is that the hen was carrying some gene that modifies black but maybe only had one copy of that gene so some of her chicks would be black and some would be that grey color.