Discussion
Match an item in List-I with an item in
List-II. Use the codes given below :
| List-I (Pheno type) | List-II (Geno type) |
|---|---|
| a. Blood group A | i. OO |
| b. Blood group B | ii. AA, AO |
| c. Blood group O | iii. AB |
| d. Blood group AB | iv. BB, BO |
Codes : a b c d
Answer: D
The correct matches are a-ii, b-iv, c-i, d-iii. Blood group A has the genotypes AA or AO, group B has BB or BO, group O is OO, and group AB is AB. The code is ii iv i iii, option D.
Options A and B pair group A with OO, which is group O. Option C gives group B the OO genotype, so it is wrong too.
Remember that the ABO blood groups are the phenotypes, the visible result that is tested with antisera, while the genotypes are the allele pairs behind them. A and B are dominant over O, so group A can be AA or AO and group B can be BB or BO, whereas O needs two O alleles and AB shows both A and B.
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