One wish to each

Three blondes were walking through the desert when they found a magic genie's lamp.After rubbing the lamp to make the genie appear, he said, "I will grant three wishes, one for each of you." The first said, "I wish I were smarter." So, she became a redhead.The second blonde said, "I wish I were smarter than she is." She became a brunette.The third blond ordered, "I wish I were smarter than both of them!"So, she became a man.