ACK! Im sorry, I dont think I ever addressed your original question! I am not sure if they came from the white hen. ALOT of black on black Jerseys will produce black chicks, but many of theose chicks have at least white wing tips (which goes away as the chick grows up), and to know you have a white hen, but NO white on the chicks at all makes me think the mom is not the white one. BUT I am sooooo not the one to ask about color genetics! Really, the Jersey Giant forum has a few pages with a list of colors and what to cross to get what color chickens, it may be the place to ask and look to get the best answers!