Describe5 marksChallenge
A scientist observes animal cells undergoing mitosis and records the following events in her notebook, but they are not in chronological order:
- The chromosomes line up at the equator of the cell.
- The cell surface membrane begins to pinch inward, dividing the cytoplasm.
- Chromosomes condense, the nuclear envelope breaks down, and spindle fibres appear.
- Sister chromatids are pulled apart towards opposite poles.
- The nuclear envelope reforms around each set of chromosomes.
Describe the correct sequence of these events during mitosis, naming the stage of mitosis (prophase, metaphase, anaphase, telophase) in which each event occurs.