The undifferentiated cell of an animal has 64 chromatids in metaphase. How many chromosomes will be present in the gametes of that animal

Options

A. 64
B. 8
C. 32
D. 16

Answer

To solve the problem of determining how many chromosomes will be present in the gametes of an animal with undifferentiated cells containing 64 chromatids in metaphase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship Between Chromatids and Chromosomes**:
- Each chromosome consists of two chromatids during metaphase. Therefore, to find the number of chromosomes, we need to divide the total number of chromatids by 2.

2. **Calculate the Number of Chromosomes**:
- Given that there are 64 chromatids, we can calculate the number of chromosomes as follows:
\[ \text{Number of chromosomes} = \frac{\text{Number of chromatids}}{2} = \frac{64}{2} = 32 \]

3. **Determine the Ploidy Level**:
- The undifferentiated cell is diploid (2n), which means it contains two sets of chromosomes. In this case, we have calculated that the diploid cell has 32 chromosomes.

4. **Calculate the Number of Chromosomes in Gametes**:
- Gametes are haploid (n), meaning they contain half the number of chromosomes compared to diploid cells. Therefore, to find the number of chromosomes in the gametes, we divide the diploid number by 2:
\[ \text{Number of chromosomes in gametes} = \frac{\text{Diploid number}}{2} = \frac{32}{2} = 16 \]

5. **Conclusion**:
- The number of chromosomes present in the gametes of the animal is 16.

### Final Answer:
The number of chromosomes present in the gametes of that animal is **16**.

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