Which match / matches is / are incorrect.
A. Spermatogonium - `46` chromosomes
B. Spermatid - `46` chromosomes
C. Sperm - `23` chromosomes
D. Sec. spermatocyte - `23` chromosomes

Options

A. Only B
B. A, B, C
C. C, D
D. A, B, C, D

Answer

To determine which match or matches are incorrect regarding the number of chromosomes in different stages of male gamete formation, let's analyze each option step by step:

### Step 1: Analyze Option A - Spermatogonium
- **Spermatogonium** is the initial cell in the spermatogenesis process.
- It is a diploid cell (2N) and contains **46 chromosomes** (44 autosomes and 2 sex chromosomes, XY).
- **Conclusion**: Option A is **correct**.

### Step 2: Analyze Option B - Spermatid
- **Spermatid** is formed after the secondary spermatocyte undergoes meiosis.
- It is a haploid cell (N) and contains **23 chromosomes** (22 autosomes and 1 sex chromosome).
- **Conclusion**: Option B is **incorrect** as it states that spermatid has 46 chromosomes.

### Step 3: Analyze Option C - Sperm
- **Sperm** is the final product of spermatogenesis.
- Like the spermatid, it is also a haploid cell (N) and contains **23 chromosomes** (22 autosomes and 1 sex chromosome).
- **Conclusion**: Option C is **correct**.

### Step 4: Analyze Option D - Secondary Spermatocyte
- **Secondary spermatocyte** is formed from the primary spermatocyte after the first meiotic division.
- It is a haploid cell (N) and contains **23 chromosomes** (22 autosomes and 1 sex chromosome).
- **Conclusion**: Option D is **correct**.

### Final Conclusion:
- The only incorrect match is **Option B** (Spermatid - 46 chromosomes).

### Summary of Incorrect Matches:
- **Incorrect Match**: B (Spermatid - 46 chromosomes)

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