| List I Mechanism | List II Intercellular Communication | ||
| A. | Direct Communication | I. | Blood stream |
| B. | Paracrine | II. | Gap junction |
| C. | Endocrine | III. | Extracellular fluid |
| D. | Synaptic transmission | IV. | Across synaptic cleft |

Study the diagram above and answer the following questions:
(a) How many alleles are involved in blood grouping?
(b) A person having 'AB' blood group has both dominant alleles. What is this inheritance type called?
(c) A man with 'A' blood group marries a woman with 'B' blood group. Can they have a child with 'O' blood group? Explain with the help of a cross.
Match the LIST-I with LIST-II 
Choose the correct answer from the options given below: