Ask us if you don't understand how an answer was obtained. AR is not as likely, in that both male parents also have to be carriers of the AR allele. This would be unusual for typically rare traits.
Color blindness is X-linked recessive.
IV-1 genotype is XbXb, meaning she inherited one recessive Xb gene from both parents. All daughters will not be affected. Multiple alleles are common. Individuals in populations develop allelic variations in their genotype by means of mutation. These antibodies could possibly cross the placenta and attack the red blood cells of the Rh-positive fetus.