What is gene ? What is nature of gene ?

Explanation

### Step-by-Step Solution:

1. **Definition of Gene**: A gene is defined as the basic functional unit of heredity. It is responsible for the transfer of traits or characteristics from parents to their offspring.

2. **Role of Genes in Heredity**: Genes play a crucial role in heredity, which is the process of passing traits from one generation to the next. This transfer of traits ensures that offspring inherit specific characteristics from their parents.

3. **Nature of Genes**:
- **Chemical Composition**: Genes are segments of DNA (deoxyribonucleic acid). DNA is a type of nucleic acid that carries genetic information.
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