February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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24Mitosis Cell CycleHard1 mark
The photomicrograph shows cells in different stages of the mitotic cell cycle.
Photomicrograph of a root-tip squash showing several cells with dark-staining chromosomes at different appearances, five labelled P, Q, R, S and T: T's chromosomes lie roughly in a row across the middle of the cell; P's chromosomes appear as two separate clusters within the cell; R's chromosomes form a loose, thread-like tangled mass not gathered into a row; Q's chromosomes form a small, tight, compact cluster; S is a cell with no visible condensed chromosomes, just a plain round nucleus
Which statements are correct?
  1. 1
    Cell T shows metaphase.
  2. 2
    DNA replication is occurring in cell R.
  3. 3
    The amount of DNA in cell P is the same as the amount of DNA in cell T.
  4. 4
    The correct order of stages in the mitotic cell cycle is shown by the labelled cells in the sequence S → R → T → P → Q.