Phases of Mitosis

It is part of reproduction, growth and repair.it involves the distribution of identical genetic material DNA to 2 daughter cells

Thre process by which 2 new daughter cells are generated

Repair of tissuesgrowth

The process by which gametes are produced

G1:cells grow rapidly wilie performing metabollic processes-makes proteins needed for DNA replication-copies some of its organelles in preparation for cell divisionS:cells' DNA is copeid during cell replicattion -all of the chromosomes have now been replicatedG2: makes final preparations to divide-makes additional proteins & organelles such as microtubules (required for mitosis)

-no chromosomes are visible -DNA & histones & centrioles all replicated

-chromosomes condensed and visible-centrioles at opposite poles of the cell- nucleolus diappears

-nuclear envelope disappears-chromosomes align at thee equator of the cell-spindle fibres connect centrioles to chromosomes

- centromeres split allowing chromatids to seperate-chromatids move towards the poles, centromeres first (pulled by motor proteins walking along the microtubule tracks)

-spindle fibres disperse-nuclear envelope forms-chromosomes uncoil & become invisible

in animal cells

• a ring of actin flaments foms around the equator of the cell, then tightens to form cleavage furrow which splits the cell in two

in plant cells

• vesicles move to the euator of the cell, line up and fuse to from 2 membranes > forms a cell plate
• a new cell wall is laid down between the membranes, which fuses with the existing cell wall