A drug has been developed to treat certain types of cancer. It prevents mitosis by binding to the spindle and preventing sister chromatids being separated and moving to opposite poles of the cell.
The photomicrograph shows cells in different phases of mitosis.
What represents the stages of mitosis that will be able to occur in a cell which is entering prophase when treated with this drug?

1 and 2
2 )
2 and 3
3 )
2 only
4 )
3 and 4
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