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