I have been trying to figure this one out for a while. I have gotten different comments from people in the past but I have not found a definite answer. I am wanting to make a sex-link between a French Black Copper Marans rooster and a Delaware hen. Apparently, to make a red sex-link you would cross a copper male with a columbian colored female. I am not sure if the Black Copper Maran is dominant for the Copper gene or not. Does anyone good with genetics know the answer? Thanks!