If each cell of the spore tetrad has 7 chromosomes, how many chromosomes are found in a dividing root tip cell in anaphase?

Options

A. 7
B. 14
C. 21
D. 28

Answer

To solve the question of how many chromosomes are found in a dividing root tip cell during anaphase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosome Number in Spores**:
- The question states that each cell of the spore tetrad has 7 chromosomes. Spores are typically haploid (n), meaning they contain one set of chromosomes. Therefore, we can conclude that the chromosome number (n) for the spores is 7.

2. **Determine the Chromosome Number in Root Tip Cells**:
- Root tip cells are part of the plant's meristematic tissue and are involved in growth. These cells are typically diploid (2n), meaning they contain two sets of chromosomes.

3. **Calculate the Diploid Number**:
- Since we know that the haploid number (n) is 7, we can find the diploid number (2n) by multiplying the haploid number by 2:
\[ 2n = 2 \times 7 = 14 \]
- Therefore, a root tip cell, being diploid, has 14 chromosomes.

4. **Identify the Chromosome Count During Anaphase**:
- During anaphase of cell division, the chromosomes are duplicated and separated. However, the total number of chromosomes remains the same. Thus, in anaphase, the root tip cell will still have 14 chromosomes.

5. **Conclusion**:
- The number of chromosomes found in a dividing root tip cell during anaphase is 14.

### Final Answer:
The number of chromosomes in a dividing root tip cell during anaphase is **14**.

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