13. The table below shows the approximate distribution of human blood groups in a sample of 100 people in a population. Blood group A Frequency 26 20 Rh + ve 4 22 18 Rh-ve B AB 3 1 O 50 42 8 (a) Calculate the percentage of Rhesus negative (Rh -) in the whole group of donors. (2mks) (b) Evolutionary changes take place in a population to maintain a balanced community, basing your answer on blood transfusion, explain the role played by nature on distribution of; 4 2 (i) Blood group O (ii) Blood group AB in the population (c) (i) State the difference between Rhesus positive and Rhesus negative blood samples? (2mks) (2mks) (2mks) (ii) A potential mother of blood group B requires a blood transfusion before her first pregnancy, what blood group(s) can she receive safely if the husband is of Rh* ve blood. Explain your answer. (2mks)