Tuesday, September 26, 2023 - Interphase Notes

Why do Cells Divide?

  • they become too large

  • to make more cells for organism growth

  • to replace old cells

Cells That do Not Divide:

  • brain cells

  • nerve cells

  • muscle cells

Things That Must Divide:

  • DNA

  • all organelles

  • cell membrane

Interphase:

  • grows cells and copies DNA

G1 (Growth 1)

  • cell grows and does normal cellular activities

  • Checkpoint 1: checks the size of the cell

S (Synthesis)

  • DNA is copied, making two sets

  • Checkpoint 2: reviews the copied DNA to make sure no mutations are present

G2 (Growth 2)

  • prepares cell for division

  • copies rest of the organelles

  • Checkpoint 3: checks DNA consistency