Albinism is due to nonsynthesis (absence) of melanin on account of absence of

Options

A. melaninase
B. luciferase
C. tyrosinase
D. lysine

Answer

### Step-by-Step Solution:

1. **Understanding Albinism**:
- Albinism is a genetic condition characterized by a complete or partial absence of melanin, which is the pigment responsible for the color of skin, hair, and eyes.

2. **Identifying the Cause**:
- The absence of melanin in individuals with albinism is due to a genetic defect. This defect affects the production of melanin, leading to lighter skin, hair, and eye color.

3. **Genetic Basis**:
- Albinism is classified as an autosomal recessive disorder. This means that an individual must inherit two copies of the mutated gene (one from each parent) to express the condition.

4. **Role of Enzymes**:
- The synthesis of melanin involves several biochemical processes, one of which requires specific enzymes. The key enzyme involved in the production of melanin is **tyrosinase**.

5. **Conclusion**:
- The absence or defect of the enzyme **tyrosinase** leads to the inability to synthesize melanin, resulting in albinism.

6. **Selecting the Correct Option**:
- Among the options provided (melaninase, luciferase, tyrosinase, lysine), the correct answer is **tyrosinase** since it is the enzyme necessary for melanin production.

### Final Answer:
Albinism is due to non-synthesis (absence) of melanin on account of the absence of **tyrosinase**.

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