The rhesus blood group gene (rhesus positive = R; rhesus neg…

The rhesus blood group gene (rhesus positive = R; rhesus negative = r) and a gene that causes a form of anemia called elliptocytosis (E = anemia; e = no anemia) show linkage. In 50 families, one parent is Rh negative with no anemia (r___e r___e) and the other parent is Rh positive with anemia (R___e r___E). Of 50 offspring: 22 are R___e r___e      22 are r­___E r­­­­___e        3 are R___E  r___e     3 are r___e r___e. Based off these 50 families. How many map units apart are the genes?