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MITOSIS PHASES QUESTION?

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MITOSIS PHASES QUESTION?

Postby reyrey389 » Sun Oct 30, 2011 6:49 am

1)In the anaphase the chromatids BEGIN to move towards opposite ends.
but in telophase the chromatids are are HAVE FINISHED MOVING towards opposite ends.

the reason I am asking this because in my notes I saw "opposite poles" for each of these phases, so I looked into it and I was curious.


2) in telophase does the chromatin of each chromosome begin to coil
OR does the chromosomes UNCOIL back into original chromatins.

in my notes it said "in telophase does the chromatin of each chromosome begin to coil"
but textbook said the second option, so I was confused


Thank you so much :D
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Postby HerrBiologie » Sun Oct 30, 2011 9:16 am

The process of mitosis is divided into 6 stages. The Interphase, Prophase, Metaphase, Anaphase, Telophase, and cytokinasis. At Interphase, there is only one cell, but after cytokinasis there are two identical cells.

Before mitosis can take place, the cell need to store enough energy to drive the chemical processes during the cell division. During this period of time, there is intense cellular activity. The cell grows in size. The length of the grow phase varies between a few hours to a few months. We the cell has stored enough energy, it is ready to divide itself.

1. Interphase
DNA has replicated, but has not formed the condensed structure of chromosome. They remain as loosely coiled chromatin.
The nuclear membrane is still intact to protect the DNA molecules from undergoing mutation.

2. Prophase
The DNA molecules progressively shorten and condense by coiling, to form chromosomes. The nuclear membrane and nucleolus are no longer visible.
The spindle apparatus has migrate to opposite poles of the cell..

3. Metaphase
The spindle fibres attach themselves to the centromeres of the chromosomes and align the the chromosomes at the equatorial plate.

4. Anaphase
The spindle fibres shorten and the centromere splits, separated sister chromatids are pulled along behind the centromeres.

 
5. Telophase
The chromosomes reach the poles of their respective spindles. Nuclear envelope reform before the chromosomes uncoil. The spindle fibres disintegrate.

Hope its helpful :]
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Re: MITOSIS PHASES QUESTION?

Postby JackBean » Mon Oct 31, 2011 11:39 am

reyrey389 wrote:1)In the anaphase the chromatids BEGIN to move towards opposite ends.
but in telophase the chromatids are are HAVE FINISHED MOVING towards opposite ends.

the reason I am asking this because in my notes I saw "opposite poles" for each of these phases, so I looked into it and I was curious.

so what's the problem?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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