Question
Which of the followings is/are correct for the inheritance of genes involved in human 'ABO' blood grouping?
It is inherited by complete dominant allele
It is inherited by complete recessive allele
It is inherited by codominant allele
It is inherited by single gene with more than two alleles
Solution
C.
It is inherited by codominant allele
D.
It is inherited by single gene with more than two alleles
Human blood type is determined by codominant alleles. It is inherited by single gene with more than two alleles. Since, there are three different alleles, there are a total of 6 different genotypes at the human ABO genetic locus which are as follows:
| Genes | Blood group |
| IAIA | A |
| IBIB | B |
| IAi | O |
| IAIB | AB |
| IAi | A |
| IBi | B |
