OCR - A-Level - Biology - Cell Cycle Flowchart

G(1)

Gap/Growth

Interphase

G(0)

Gap

Apoptosis - cell death

Cell differentiation

Senescence - ageing

Cells grow and increase in size.

Transcription of genes

Making enzymes for S phase

Tumour protein p53 controls the phase by preventing uncontrollable division

Synthesis

DNA replicates

Pair of sister chromatids (Each contains double helix)

Rapid to reduce the chances of mutations

G(2)

Gap/Growth

Cells grow

Cell growth stops

Cellular division

Cytokinesis

Division of cytoplasm into two daughter cells

If conditions are not met for growth, G(0)

Via checkpoint chemical

Checkpoint ensures cell is ready