544051
cell
division
- INTERPHASE
- also known as resting
phase .cell preparing for
division.
- G1 Phase
- interval between mitosis and DNA replication
- interval between mitosis and DNA replication
- S phase
- DNA replication. Amount of DNA doubles
Nota:
- there is not increase in the CHROMOSOME NUMBER.
- DNA replication. Amount of DNA doubles
- G2 phase
- proteins are synthesized in preparation for mitosis
- proteins are synthesized in preparation for mitosis
- Quiescent stage
- metabolically active but no longer proliferate
Nota:
- some cells like heart cells do not divide.these cells exit G1 phase to enter an inactive stage called quiescent stage.
- metabolically active but no longer proliferate
- also known as resting
phase .cell preparing for
division.
- M PHASE ( MITOSIS)
- Prophase
- Replicated chromosomes
condense and become visible
Nota:
- nucleolus and nuclear membrane disappear. Microtubules are assembles into mitotic spindle.Centrioles move to opposite poles.
- Replicated chromosomes
condense and become visible
- Metaphase
- chromosomes line up at the equator
of the spindle : METAPHASE plate
Nota:
- spindle fibres get attached to kinetochores of chromosomes.
- chromosomes line up at the equator
of the spindle : METAPHASE plate
- Anaphase
- centrosomes split
and chromatids
separate
Nota:
- chromatids move to opposite poles.
- centrosomes split
and chromatids
separate
- Telophase
- chromosomes cluster at
opposite poles
Nota:
- nuclear envelope assembles around the chromosome clusters. nucleolus and golgi complex reform.
- chromosomes cluster at
opposite poles
- also known as
EQUATIONAL DIVISION
- Prophase
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