Have your body changed in the pass six

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 parent cells identical to the

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)

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 (G 1), replication of chromosome (S) and synthesis of proteins necessary for mitosis (G 2). • 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)