Which of the following is not haploid?

Options

A. Primary spermatocyte
B. Spermatogonia
C. Ootid
D. Both (a) and (b)

Answer

To determine which of the following options is not haploid, we need to analyze each option provided:

1. **Primary Spermatocytes**:
- These are formed from spermatogonia through mitotic division.
- Since mitosis maintains the chromosome number, primary spermatocytes are diploid (2n).

2. **Spermatogonia**:
- These are the initial male germ cells that undergo mitosis to produce primary spermatocytes.
- Spermatogonia are also diploid (2n).

3. **Ovum (Otid)**:
- The ovum is the female gamete produced through oogenesis.
- Ova are haploid (n), as they are formed through meiosis, which reduces the chromosome number by half.

4. **Both A and B**:
- This option suggests that both primary spermatocytes and spermatogonia are not haploid, which is true since both are diploid.

Now, summarizing the findings:
- Primary spermatocytes (diploid)
- Spermatogonia (diploid)
- Ovum (haploid)
- Both A and B (diploid)

Thus, the answer to the question "Which of the following is not haploid?" is **Both A and B**.

### Steps Summary:
1. Analyze primary spermatocytes: diploid (2n).
2. Analyze spermatogonia: diploid (2n).
3. Analyze ovum: haploid (n).
4. Conclude that both primary spermatocytes and spermatogonia are not haploid.