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?

Mitosis Definition: 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) Interphase Prophase Metaphase Anaphase Telophase (Cytokinesis)

IPMAT (C)  IPMAN © Interphase Prophase Metaphase Anaphase Telophase (Cytokinesis)

Homologous chromosome and sister chromatids Chromosome in Mitosis Homologous chromosome and sister chromatids

Anaphase Centromere 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)