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Question
Four stages of mitotic cell division are shown in the diagram.
At which stage are the chromosomes at the equator of the cell?
Responses
A PP
B QQ
C RR
D S
It appears that there is a mention of a diagram which we cannot visualise, but based on common knowledge of cell biology, I can help you identify at which stage of mitosis chromosomes align at the equator (metaphase plate) of the cell. The stages of mitosis are as follows:
1. Prophase (not labeled, but let's call it PP for continuity) - Chromosomes condense and become visible, but they do not align at the equator yet.
2. Metaphase (let's call this QQ) - Chromosomes align at the equator of the cell.
3. Anaphase (let's call this RR) - The chromatids are pulled apart to opposite poles of the cell.
4. Telophase (let's call this SS) - Chromosomes arrive at the poles and begin to decondense; the nuclear envelope starts to reform.
From the descriptions above, the stage where the chromosomes align at the equator of the cell is during Metaphase. If we align these descriptions with the lettered options you've provided, your answer would be:
B QQ
This is assuming that QQ represents Metaphase in the context of your diagram. If your list of stages used different labels, adjust accordingly.