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A picture of dividing Drosophila cell th...

A picture of dividing Drosophila cell through a microscope show that the cell contains 8 chromosomes, each consisting of two chromatids. The picture must have been taken during.

A

Mitotic metaphase

B

Mitotic Anaphase

C

Meiotic Anaphase II

D

Meiotic Telophase II

Text Solution

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The correct Answer is:
To determine when the picture of a dividing Drosophila cell with 8 chromosomes, each consisting of two chromatids, was taken, we can follow these steps: ### Step-by-Step Solution: 1. **Understand Chromosome Structure**: Each chromosome in the picture has two chromatids. This indicates that the chromosomes have already been replicated. In a typical cell cycle, chromosomes are replicated during the S phase of interphase. 2. **Identify the Total Number of Chromosomes**: The picture shows a total of 8 chromosomes. Since each chromosome consists of two chromatids, this means that the cell is in a stage of division where the chromatids are still joined together. 3. **Determine the Stage of Cell Division**: The cell division process includes several stages: prophase, metaphase, anaphase, and telophase. During metaphase, chromosomes are aligned at the metaphase plate and are still in the form of sister chromatids. 4. **Eliminate Other Stages**: - **Anaphase**: In this stage, sister chromatids are pulled apart towards opposite poles of the cell. Therefore, if the cell had reached anaphase, we would not see chromosomes with two chromatids. - **Telophase**: At this stage, the chromatids have already separated and are being enclosed in new nuclear membranes. Thus, we would not see paired chromatids. - **Prophase**: While chromosomes are visible, they are not yet aligned at the metaphase plate. 5. **Conclude the Correct Stage**: Since the picture shows chromosomes that are still paired as sister chromatids and aligned, it is clear that the picture was taken during **metaphase**. This is the only stage where chromosomes are arranged on the metaphase plate and consist of two chromatids. ### Final Answer: The picture must have been taken during **metaphase**. ---
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