During spermatogensis, second meietic division occurs during

Options

A. Spermatogonia A `to` Spermatogonia B
B. Primary spermatocyte `to` Secondary spermatocyte
C. Spermatogonia B `to` Primary spermatocyte
D. Secondary spermatocyte `to` Spermatid

Answer

To solve the question about when the second meiotic division occurs during spermatogenesis, we need to understand the process of spermatogenesis and the stages involved. Here’s a step-by-step breakdown:

### Step 1: Understand Spermatogenesis
Spermatogenesis is the process of sperm formation that occurs in the male reproductive system. It involves several stages starting from primordial germ cells.

**Hint:** Remember that spermatogenesis leads to the formation of male gametes (sperms) through a series of cell divisions.

### Step 2: Identify the Stages of Spermatogenesis
1. **Spermatogonia**: These are the initial germ cells that divide by mitosis to produce more spermatogonia.
2. **Primary Spermatocytes**: These are formed from spermatogonia and undergo meiosis I.
3. **Secondary Spermatocytes**: These are produced from primary spermatocytes after meiosis I.
4. **Spermatids**: These are formed from secondary spermatocytes after meiosis II.

**Hint:** Focus on the transitions between these stages to identify where meiosis occurs.

### Step 3: Analyze the Meiotic Divisions
- **Meiosis I**: This is a reductional division that occurs between primary spermatocytes and secondary spermatocytes, resulting in two haploid secondary spermatocytes.
- **Meiosis II**: This is an equational division that occurs between secondary spermatocytes and spermatids, resulting in four haploid spermatids.

**Hint:** Remember that meiosis I reduces the chromosome number, while meiosis II does not.

### Step 4: Evaluate the Options Given
1. **Spermatogonia A to Spermatogonia B**: This is a mitotic division, not meiotic.
2. **Primary Spermatocytes to Secondary Spermatocytes**: This is meiosis I, not meiosis II.
3. **Spermatogonia B to Primary Spermatocytes**: This is also a mitotic division.
4. **Secondary Spermatocytes to Spermatids**: This is where meiosis II occurs.

**Hint:** Look for the option that describes the transition where the second meiotic division takes place.

### Step 5: Conclusion
The correct answer is **Secondary Spermatocytes to Spermatids**, as this is where the second meiotic division occurs.

**Final Answer:** The second meiotic division occurs during the transition from secondary spermatocytes to spermatids.