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When do cells divide?
For growth (develop a body)
Replace worn out cells
Repair damaged tissue
What is the cell cycle?
When a cell that is actively dividing goes through a series of stages
3 main phases of the cell cycle?
Interphase, mitosis, cytokinesis
Interphase
Cell grows
Sub-cellular structures replicate
DNA replicates creating 2 copes of each chromosme
Further growth
DNA checked for errors
Mitosis
Chromosomes move to opposite poles
Nucleus divides
Genetic material splits in 2
Cytokinesis
Cytoplasm splits into 2
Cell membrane reforms forming 2 genetically identical daughter cells
Why can’t different species undergo repdroductio?
Different number of chromsomes