Thalassemia is controlled by ______ genes preset on ______ chromosome.

Options

A. one, 16
B. two, 11
C. two, 16
D. three, 11

Answer

**Step-by-Step Solution:**

1. **Understanding Thalassemia**: Thalassemia is a genetic disorder that affects the production of hemoglobin, which is essential for carrying oxygen in the blood. It is inherited from parents and is classified as an autosomal recessive disorder.

2. **Identifying the Type of Genes**: The genes responsible for thalassemia are related to the synthesis of globin chains in hemoglobin. Specifically, the disorder is associated with mutations or deletions in these genes.

3. **Locating the Genes**: The genes that control thalassemia are the HBA1 and HBA2 genes. These genes are located on a specific chromosome.

4. **Chromosome Identification**: Thalassemia is associated with chromosome 16. This chromosome contains the genes that are crucial for the proper synthesis of hemoglobin.

5. **Conclusion**: Therefore, thalassemia is controlled by **two genes** (HBA1 and HBA2) present on **chromosome 16**.

**Final Answer**: Thalassemia is controlled by **two genes** present on **chromosome 16**.

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