Questions and Problems 299 



there is crossing over, it should be small in amount and difficult 

 to prove. 



QUESTIONS AND PROBLEMS 



1. Blood from a group rabbit is injected into a second rabbit. 

 Blood from the second rabbit is then mixed with blood from all four 

 groups. With which groups, if any, will a positive agglutinin reaction 

 be obtained? 



2. What agglutinins \^ill develop in the blood of a group rabbit if 

 blood is injected into it from (a) group Hi; (6) group H2; (c) group H1H2 

 rabbits? 



3. A person of blood group B is injured and must be given a trans- 

 fusion. You, the physician, are offered blood from people of all four 

 groups. Which groups would you accept and which would you reject? 

 Why? 



4. What would be the blood groups of the offspring of the follo-wdng 

 crosses : 



(a) 00 X AO 



(5) 00 X BO 



(c) .-10 X AB 



(d) AB X BO 



(e) BB X BO 



5. Mrs. W is of group A and Mr. W is of group B. Mrs. Y is of 

 group AB and Mr. Y is of group B. There are four children, one of 

 each group. Can you identify any child as the offspring of one couple 

 but not of the other? Could any of the children be the offspring of either 

 couple? 



6. What may and what must be the blood groups of the children 

 of the following crosses: 



(a) Group X) and group B 



(b) Group B and group AB 



(c) Group A and group B 



(d) Group and group 



(e) Group AB and group 



7. If the mother is of group 0, to which blood groups can the father 

 7iot belong if the children are of (a) group A; (6) group O; (c) group B? 



8. What may be the blood types of the children of the following 



crosses : 



