cell cycle

• growth is adding more cells
• repair is replacing damaged cells
• interphase consists of G1, S and G2
• what provides the energy for cell division?

  ATP
• what happens during the G1 phase of interphase?

  • cell grows
  • new organelles and proteins are made
• what happens during the S phase of interpahse?

  • DNA replicates
• what happens during the G2 phase of interpahse?

  • cell keeps growing and proteins needed for cell division are made
• what happens during prophase?

  • chromosomes condense
  • nuclear envelope breaks down
  • chromosomes are free in the cytoplasm
• what happens during metaphase?

  • chromosomes line up in the middle of the cell
  • then attach to spindle by a centromere
• what happens during anaphase?

  • a pair of sister chromatids are separated
  • spindle fibres contract
  • chromatids are pulled to opposite poles
• what happens during telophase?

  • chromatids reach opposite poles on the spindle
  • a nuclear envelope forms around each group
• what happens during cytokinesis?

  • cytoplasm splits
  • 2 daughter cells form which are genetically identical to each other and to the parent cell
• fill in the blanks

  A) cell cycle

  B) G1

  C) S

  D) G2

  E) cytokinesis

  F) telophase

  G) anaphase

  H) metaphase

  I) prophase

  J) interphase