An individual having different alleles of a gene is

Options

A. Heterozygous
B. Homozygous
C. Diploid
D. Mosaic

Answer

To solve the question "An individual having different alleles of a gene is", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Alleles**:
- Alleles are different forms of a gene that can exist at a specific locus on a chromosome. For example, a gene for flower color might have a purple allele and a white allele.

2. **Defining Key Terms**:
- **Homozygous**: This term refers to an individual that has two identical alleles for a particular gene (e.g., AA or aa).
- **Heterozygous**: This term refers to an individual that has two different alleles for a particular gene (e.g., Aa).
- **Diploid**: This term refers to organisms that have two sets of chromosomes, one set inherited from each parent. Most animals, including humans, are diploid.
- **Mosaic**: This term refers to an individual composed of cells with different genetic makeups, often resulting from mutations or chimerism.

3. **Analyzing the Options**:
- The question asks for an individual with different alleles.
- The option "heterozygous" fits this description as it indicates the presence of two different alleles.
- The other options (homozygous, diploid, mosaic) do not specifically refer to having different alleles of a gene.

4. **Conclusion**:
- Based on the definitions and analysis, the correct answer to the question is **heterozygous**.

### Final Answer:
The correct answer is **heterozygous**.

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