if the number of chromosomes in root cells is 14, what will be the number of chromosomes in synergids cells of an ovule of that parent

Options

A. 7
B. 14
C. 21
D. Incomplete information

Answer

To solve the question regarding the number of chromosomes in the synergid cells of an ovule, given that the number of chromosomes in root cells is 14, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chromosome Number in Root Cells**:
- The problem states that the number of chromosomes in root cells is 14. Root cells are somatic cells and are typically diploid (2n).

2. **Determine the Haploid Number**:
- Since root cells are diploid (2n), we can find the haploid number (n) by dividing the diploid number by 2.
- Calculation:
\[ n = \frac{2n}{2} = \frac{14}{2} = 7 \]
- Therefore, the haploid number of chromosomes is 7.

3. **Understand the Formation of Synergid Cells**:
- Synergid cells are part of the female gametophyte (embryo sac) in flowering plants. They are formed from the functional megaspore, which is haploid.
- The functional megaspore undergoes mitosis to produce the embryo sac, which contains 8 nuclei, including the synergids.

4. **Confirm the Chromosome Number in Synergid Cells**:
- Since the synergid cells are derived from the haploid megaspore, they will also be haploid.
- Thus, the number of chromosomes in the synergid cells is the same as the haploid number calculated earlier, which is 7.

5. **Final Answer**:
- Therefore, the number of chromosomes in the synergid cells of the ovule is 7.

### Conclusion:
The answer to the question is **7**.

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