Question

match each checkpoint with the action it checks for.
checks whether the microtubules have attached to the centromeres of the chromosomes
checks for cell size and dna damage
checks whether dna has doubled and repairs it if damaged
g₂ checkpoint
m checkpoint
g₁ checkpoint

Explanation:

• The G₁ checkpoint occurs before DNA replication, so it assesses cell size and looks for DNA damage to ensure the cell is ready to enter the synthesis phase.
• The G₂ checkpoint takes place after DNA replication; it verifies that DNA has fully duplicated and repairs any damage before the cell enters mitosis.
• The M (metaphase) checkpoint ensures that all microtubules are properly attached to chromosome centromeres before the cell proceeds to anaphase.

Answer:

• G₁ checkpoint: checks for cell size and DNA damage
• G₂ checkpoint: checks whether DNA has doubled and repairs it if damaged
• M checkpoint: checks whether the microtubules have attached to the centromeres of the chromosomes