The diagram shows the cell cycle of a mammalian cell.
Checkpoints in the cell cycle of mammals prevent the cycle from continuing when mistakes are made or DNA is damaged.
Four of the checkpoints are described.
1 Mitosis is blocked if DNA replication is incomplete.
2 Anaphase is blocked if the assembly of chromatids on the spindle is unsuccessful.
3 DNA replication is blocked if DNA is damaged.
4 DNA replication stops if damage to DNA has not been repaired.
In which phases of the cell cycle do these checkpoints occur?
1 )
A
B
3 )
C
4 )
D
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