Biology OCR Module 2.6
Cell division
, 6.1 A) The cell cycle:
The cell cycle is a highly ordered sequence of events that takes place in a cell, resulting in division of
the cell and the formation of two genetically identical daughter cells.
G1-Growth phase:
• Cells grow and increase in size
• Transcription of genes made
• protein synthesis occurs
• organelles duplicate
G1 checkpoint ensures the cell is ready for DNA synthesis
S- synthesis phase:
• DNA replicates producing identical sister chromatids
CDK complexes ensures all DNA is replicated once
G2-Growth:
• Cells grow
• Energy stores grow
G2 checkpoint ensures the cell is ready for Mitotic phase
M-Mitosis:
• Cell growth stops
• Nuclear division-PMAT
Cell division
, 6.1 A) The cell cycle:
The cell cycle is a highly ordered sequence of events that takes place in a cell, resulting in division of
the cell and the formation of two genetically identical daughter cells.
G1-Growth phase:
• Cells grow and increase in size
• Transcription of genes made
• protein synthesis occurs
• organelles duplicate
G1 checkpoint ensures the cell is ready for DNA synthesis
S- synthesis phase:
• DNA replicates producing identical sister chromatids
CDK complexes ensures all DNA is replicated once
G2-Growth:
• Cells grow
• Energy stores grow
G2 checkpoint ensures the cell is ready for Mitotic phase
M-Mitosis:
• Cell growth stops
• Nuclear division-PMAT
