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Have your body changed in the pass six months?
Tall/Weight
Are you taller?
Did your hair grow?
Clip your toenails?
Broken a bone recently?
Wound – how does your body repair itself?
MitosisDefinition:
To create two identical daughter cells that are genetically identical to the parent cells
Q: What kind of cells would perform mitosis?
A: Somatic cells (all body cells except gamete cells)
Acronym for MITOSIS
IPMAT (C)InterphaseProphase
MetaphaseAnaphaseTelophase
(Cytokinesis)
IPMAT (C) IPMAN ©
InterphaseProphase
MetaphaseAnaphaseTelophase
(Cytokinesis)
MITOSIS VIDEO 1
Chromosome in MitosisHomologous chromosome and sister chromatids
AnaphaseCentromere splits and homologus chromosomes
go to opposite poles of cell
Interphase
Interphase
•Interphase is not part of mitosis•It involves synthesis of new organelles (G1), replication of chromosome (S) and synthesis of proteins necessary for mitosis (G2).•Chromosomes appears as thread-like structures called chromatin.
Prophase
Prophase• Chromatids (replicated chromosomes condense and become visible in a light microscope)• The nucleolus disappears• Paired centrioles (centrosomes) move opposite ends of the cell• Spindle forms• Asters (short microtubules radiating from centrioles) form
Metaphase
Metaphase• Sister chromatids line up at the spindle equator• Each centromere attaches itself to the spindle fibre• At the end of metaphase, the centromeres divide.
Anaphase
Anaphase• The separated chromatids, now called chromosomes are pulled apart towards the opposite poles by the contraction of spindle fibres• Anaphase is completed when chromosomes arrive at the poles
Telophase
Telophase•Chromosomes reach the poles of the cell and cannot be seen clearly•The spindle fibres disappear and centrioles replicate•Nuclear membrane re-forms around chromosomes and the nucleolus reappears in each nucleus•Telophase may lead straight into cytokinesis
Cytokinesis• Cytokinesis is the separation of the parent cell’s cytoplasm at the end of a mitosis• Cytokinesis in animal and plant cells are different• In animal cell:• CLEAVAGE FURROW (division
furrow)
GROUP ACTIVITY
Acronym for MITOSIS
IPMAT (C)InterphaseProphase
MetaphaseAnaphaseTelophase
(Cytokinesis)
IPMAT (C) “IPMAN ©”
InterphaseProphase
MetaphaseAnaphaseTelophase
(Cytokinesis)
Interphase
Prophase
Metaphase
Anaphase
Telophase
MITOSIS VIDEO 1
MITOSIS VIDEO 2