Mitosis occurs in

Options

A. Haploid individuals
B. Diploid individuals
C. Both haploid individuals and diploid individuals
D. In bacteria only

Answer

**Step-by-Step Solution:**

1. **Understanding Mitosis**: Mitosis is a type of cell division that results in two daughter cells, each having the same number of chromosomes as the parent cell. This means that the chromosome number remains constant.

2. **Types of Individuals**: Mitosis can occur in both haploid and diploid individuals.
- **Haploid Individuals**: These are organisms or cells that have a single set of chromosomes (n). Examples include gametes (sperm and egg cells) and certain fungi.
- **Diploid Individuals**: These are organisms or cells that have two sets of chromosomes (2n). Most animals and plants are diploid in their somatic cells.

3. **Examples of Mitosis in Different Organisms**:
- In plants, haploid spores can undergo mitosis to produce gametophytes.
- In animals, growth and tissue repair occur through mitosis in diploid cells.

4. **Mitosis in Bacteria**: Bacteria are generally haploid and reproduce asexually through a process called binary fission, which is similar to mitosis but not exactly the same. However, the concept of mitotic-like division can be applied in understanding bacterial reproduction.

5. **Conclusion**: Based on the above points, mitosis occurs in both haploid and diploid individuals. Therefore, the correct answer to the question is that mitosis occurs in both haploid individuals and diploid individuals.

**Final Answer**: Mitosis occurs in both haploid individuals and diploid individuals.

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