Gametogenesis includes

Options

A. production of gametes from secondary sex organs through meiosis
B. production of gametes from primary sex organs through mitosis
C. production of gametes from secondary sex organs through mitosis
D. production of gametes from primary sex organs through reduction division

Answer

### Step-by-Step Solution

1. **Understanding Gametogenesis**:
- Gametogenesis is the biological process through which gametes (sperms in males and ova in females) are produced. This process is crucial for sexual reproduction.

2. **Identifying the Types of Gametes**:
- Male gametes are called sperms, while female gametes are called ova (or eggs). Both types of gametes are haploid, meaning they contain half the number of chromosomes compared to diploid somatic cells.

3. **Role of Primary and Secondary Sex Organs**:
- Primary sex organs are responsible for the production of gametes. In males, the primary sex organ is the testis, and in females, it is the ovary.
- Secondary sex organs (or accessory organs) do not produce gametes but play supportive roles in reproduction. Examples include the penis, vagina, uterus, and mammary glands.

4. **Process of Gametogenesis**:
- Gametes are formed through a special type of cell division called meiosis, which is a reductional division. This process reduces the chromosome number by half, resulting in haploid cells.

5. **Analyzing the Options**:
- **Option A**: Production of gametes from secondary sex organs through meiosis - Incorrect, as secondary sex organs do not produce gametes.
- **Option B**: Production of gametes from primary sex organs through mitosis - Incorrect, as gametes are produced through meiosis, not mitosis.
- **Option C**: Production of gametes from secondary sex organs through mitosis - Incorrect for the same reason as option A.
- **Option D**: Production of gametes from primary sex organs through reductional division (meiosis) - Correct, as this accurately describes the process of gametogenesis.

6. **Conclusion**:
- The correct answer is **Option D**: Production of gametes from primary sex organs through reductional division (meiosis).