Read the following paragraph carefully and find out the correct words for all the three blanks indicated as (A) (B) and (C )
"the substitution of amino acid in the globin protein results due to the single base subsitution at the `6^(th)` codon of the `beta`-globin gene from `overset((A))("_____")` to `overset((B))("_____")`. The mutant haemoglobin molecule undergoes polymerisation under `overset((C))("_____")` tension causing the change in the shape of the RBO from biconcave disc to elongated sickle-like structure.

Explanation

To solve the question, we need to fill in the blanks (A), (B), and (C) in the provided paragraph based on our understanding of sickle cell anemia and the genetic mutation involved.

### Step-by-Step Solution:

1. **Understanding the Mutation**:
- Sickle cell anemia is caused by a point mutation in the beta-globin gene. This mutation results in a change in the amino acid sequence of the hemoglobin protein.

2. **Identifying the Codon Change**:
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