Inheritance pattern of ABO blood groups in humans shows dominance. codominance and multiple allelism. Explain each concept with help of blood group genotypes.

Explanation

To explain the inheritance pattern of ABO blood groups in humans, we will discuss three key concepts: dominance, co-dominance, and multiple allelism. Each concept will be illustrated with the relevant blood group genotypes.

### Step-by-Step Solution:

1. **Understanding Blood Groups and Alleles:**
- Humans have four possible blood types: A, B, AB, and O.
- The gene responsible for these blood groups is represented by the symbol "I," which has three alleles:
- \( I^A \) (for blood group A)
...