The gene that determines ABO blood type and the gene for nail-patella syndrome are on the same chromosome.Previous results indicate that the B allele for ABO blood type and the autosomal dominant nail-patella syndrome are linked.In one particular family,2 members out of 10 inherited nail-patella syndrome but did not inherit the B allele.They were the only family members that inherited only one of the two alleles.What is the distance between the gene for nail-patella syndrome and the gene for ABO blood group as determined for this family?