Question

the g1/s checkpoint, the g2/m checkpoint, and the m/g1 checkpoint.

1. describe what each checkpoint does.

g1 | check (cell size, growth factor, dna damage)
g2 |
m |

Explanation:

The G1 checkpoint checks for cell size, nutrients, growth factors and DNA damage. The G2 checkpoint ensures DNA replication is complete and checks for DNA damage before mitosis. The M checkpoint monitors the attachment of sister chromatids to spindle fibers during mitosis.

Answer:

G1: Check cell size, nutrients, growth factors, DNA damage.
G2: Check DNA replication completion and DNA damage before mitosis.
M: Monitor sister - chromatid attachment to spindle fibers in mitosis.