Stages of mitosis
Interphase:
Intarphase is a period of cell growth,when the cell synthesizes new molecules and organelles.There are 3 stages in interphese such as G1 , S and G2.In G1 part of interphase cell grows and continues its normal metabolic roles.In S part cell replicates its DNA and in G2 part cell prepares for mitotic stage.
Prophase:
In this stage changes occur in nucleus and cytoplasm.The chromatin fibers become more tightly.Each duplicated chromosome appears as two identical sister chromatids joined together, with a narrow waist at the centromere.In cytoplasm the mitotic spindle begins to form as microtubules rapidly grow out from the centrosomes , which begin to move away from each other.
Prometaphase:
The nuclear envelope breaks into fragments and dissapears.Microtubules emerging from a centrosomes at the poles of the mitotic spindle reach the chromosomes , now highly sondensed.At the centromere, each sister chromatids have kinetochores.Some of spindle microtubules attach to the kinetochores.Other spindle microtubules make contact with microtubules coming from the opposite pole.They force to chromosomes to come to center of the cell.
Metaphase:
The mitotic spindle is completely formed with its poles at opposite ends of the cell.The chromosomes stands on the metaphase plate.For each chromosome , the kinetochores of the two sister chromatids face opposite poles of the spindle.
Anaphase:
It begins when the two centromeres of each chromosome come apart , separating the sister chromatids.Once separate,each sister chromatid is daughter chromosome.Anaphase is over when the chromosomes have reached the two poles of the cell.
Telophase:
Daughter nuclei appear at the two poles of the cell as nuclear envelopes form again around the chromosomes. By the end of telophase, the chromatin fiber of each chromosome uncoils ,and the mitotic spindle is dissapears.The equal division of one nucleus into two
genetically identical daughter nuclei is completed.
Cytokinesis:
This stage means the division of cytoplasm.It usually occurs along with telophase with two daughter cells completely separating soon after the end of mitosis.In animal cells a cleavage furrow forms at the cell pinches into two.
Intarphase is a period of cell growth,when the cell synthesizes new molecules and organelles.There are 3 stages in interphese such as G1 , S and G2.In G1 part of interphase cell grows and continues its normal metabolic roles.In S part cell replicates its DNA and in G2 part cell prepares for mitotic stage.
Prophase:
In this stage changes occur in nucleus and cytoplasm.The chromatin fibers become more tightly.Each duplicated chromosome appears as two identical sister chromatids joined together, with a narrow waist at the centromere.In cytoplasm the mitotic spindle begins to form as microtubules rapidly grow out from the centrosomes , which begin to move away from each other.
Prometaphase:
The nuclear envelope breaks into fragments and dissapears.Microtubules emerging from a centrosomes at the poles of the mitotic spindle reach the chromosomes , now highly sondensed.At the centromere, each sister chromatids have kinetochores.Some of spindle microtubules attach to the kinetochores.Other spindle microtubules make contact with microtubules coming from the opposite pole.They force to chromosomes to come to center of the cell.
Metaphase:
The mitotic spindle is completely formed with its poles at opposite ends of the cell.The chromosomes stands on the metaphase plate.For each chromosome , the kinetochores of the two sister chromatids face opposite poles of the spindle.
Anaphase:
It begins when the two centromeres of each chromosome come apart , separating the sister chromatids.Once separate,each sister chromatid is daughter chromosome.Anaphase is over when the chromosomes have reached the two poles of the cell.
Telophase:
Daughter nuclei appear at the two poles of the cell as nuclear envelopes form again around the chromosomes. By the end of telophase, the chromatin fiber of each chromosome uncoils ,and the mitotic spindle is dissapears.The equal division of one nucleus into two
genetically identical daughter nuclei is completed.
Cytokinesis:
This stage means the division of cytoplasm.It usually occurs along with telophase with two daughter cells completely separating soon after the end of mitosis.In animal cells a cleavage furrow forms at the cell pinches into two.