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Growth and division of cell (Mitosis (Interphase (G2 phase (Enzyme and…
Growth and division of cell
Mitosis
Metaphase
Thick, coiled chromosomes are lined up in the center of the cell
spindle fibers are attached to the chromosomes
Anaphase
Chromosomes break at centromeres
sister chromatids move to opposite ends of the cell
Prophase
Chromosomes appeared condensed
Nuclear envelope is not apparent
Telophase
Centromeres reach the opposite poles of
spindle fibers dissolve and a nuclear membrane forms around each mass of chromatin
Interphase
S Phase
Each chromosomes replicate to form two sister chromatids
DNA is replicated
G2 phase
Enzyme and protein synthesis occurs
ATP produced in large amount
Centrioles replicate
G1 phase
cell is metabolically active in this stage
It duplicates its organelles and cytosolic components
Cytokinesis
Last stage of cell division
Division of cytoplasm occurs
Meiosis
Meiosis 1
Metaphase I
Chromosomes are fully condensed
They align on metaphase plate in between the poles
Anaphase I
Homologous chromosome separate to each side of the cell
The sister chromatid separates and the centromere splits into two chromatids
Prophase I
Chromosomes become visible as they shorten, coil and thicken
Nuclear envelop breaks up and disappears
Telophase and Cytokinesis I
The homologous chromosomes arrive at the opposite poles
New nuclear membrane forms around each st of chromosomes
cytokinesis then divides the cell into daughter cells
Meiosis 2
Metaphase II
It is the second stage of meiosis II
In each of the two daughter cells produced by first meiotic division, the spindle again draws the chromosomes to the metaphase plate
Anaphase II
Sister chromatid of each chromosome separate and move towards opposite poles
This is the third step of division
Prophase II
The nuclear envelope breaks down and the spindle apparatus forms
Meiosis II begins without any further replication of chromosomes
Telophase and Cytokinesis II
Chromosomes reach opposite poles
Two cells produced by meiosis divide to form four haploid cells