How does the gene 'I' control ABO blood groups in humans? Write the effect the gene has on the structure of red blood cells.`

Explanation

**Step-by-Step Solution:**

1. **Introduction to ABO Blood Groups:**
- The ABO blood groups in humans are classified into four types: A, B, AB, and O. These blood groups are determined by the presence or absence of specific antigens on the surface of red blood cells (RBCs).

2. **Role of Gene 'I':**
- The gene responsible for controlling the ABO blood groups is known as the gene 'I'. This gene has three alleles: IA, IB, and i.
- Each individual inherits two alleles, one from each parent.
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