mistosis

mitosis

produces 2 genetically identical cells

needed for growth and repairing damaged tissue

cell cycle - mitosis happens after interphase ( cell growth - G1, S, G2)

4 stages

1) prophase

-chromosomes condense - visable chromatin

- centrioles move to opposite ends of cell

-spindle fibres form, from centrioles

nuclear envelope breaks down, chromosomes free

2) metaphase

sister chromatids line up along the middle of the cell

spindle fibres attach to their centromere

3) anaphase

centromeres split, separating each sister chromatid

spindle fibres contract, pulling chromatids to opposite poles. led by centromere - looks like 'v' shape

4) telophase

chromatids become long and thin again = chromosomes

nuclear envelope forms around each group of chromosomes = 2 nuclei

cytokinesis = cytoplasm divides

now 2 genetically identical daughter cells to the parent cell

each daughter cell starts interphase, preparing for next mitosis division