関連ワード:
do both parents have to have the redhead gene do both parents have to have the red hair gene do both parents have to carry the red head gene do both parents have to have the ginger gene to have a ginger child do both parents have to carry the red hair gene do both parents need the redhead gene do both parents need to carry the ginger gene do both parents need the red hair gene do both parents have to have a recessive gene for red hair do both parents have to be carriers for red hair
