Cell replication Copy

For a cell to replicate itself it goes through a process called mitosis. This is where one cell splits and creates a second identical cell.




Cell growth and cellular routine activity. In addition to routine activities the cell prepares for the next cell division

There are three sub phases where the cell grows by producing proteins and organelles

G1: cell grows in size and volume. May vary in length but usually the longest phase

S phase:  synthesis of DNA 46 chromosomes become 92. Chromatin is reproduced which is an essential component for the mitotic phase

G2: further growth and preparation




Chromatin becomes tightly coiled

Each of the 46 chromatids is paired with its copy to create a chromosome unit

Each unit is joined at the centromere and separated by a mitotic spindle to form the mitotic apparatus (formed from microtubules)

Centrioles migrate with one at each end of the cell. The nuclear envelope disappears

Metaphase Chromatids align in the centre of the spindle along with their centromeres
Anaphase The chromatids are now chromosome again.  The centromeres separate and one of each of the pair of chromosomes migrate to each end of the spindle, as the microtubules forming the mitotic spindles contract
Telephase The mitotic spindle disappears, the chromosomes uncoil and the nuclear envelope reforms