Prophase of Mitosis

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Toria
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Prophase of Mitosis

Post by Toria » Mon Jul 31, 2006 2:31 pm

I have looked all over in my book and googled to find an answer and I can not find an answer. :( I'd appreciate it if I had some help. :)

During prophase of mitosis, nuclear DNA is in which of the following forms?
(A) Daughter chromosomes
(B) Chromatin
(C) Chromsomes consisting of two sister chromatids
(D) Single sister chromatids
(E) Single linear chromosomes

I think it could be either A or C, but I'm not exactly sure. :cry:

~Toria
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Post by sdekivit » Mon Jul 31, 2006 3:19 pm

what happens in the profase of the mitose and what in the meiose. This will exclude one of your answer where you're doubting about.

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Post by Toria » Mon Jul 31, 2006 4:02 pm

This link has a picture of the process

http://www.windows.ucar.edu/earth/Life/ ... tosis.html

So let's see if I have this right,

1) There's a set of chromosomes - a red strand and a blue strand (which hold DNA) and they are duplicated so there's 2 strands of red and 2 strands of blue
2) They go into a process of separation and 1 blue and red go to one cell and 1 blue and red go to the other cell
3) As a result you have 2 diploid cells? each containing chromosomes

So if it is during the process ... it'd be C because A would be after when the process is totally over with? >.< am I thinking too much?

~Toria
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Post by Toria » Mon Jul 31, 2006 5:51 pm

Or would it be A? because in my webster dictionary is says:

1. The sequential differentiation and segregation of replicated chromosomes in a cell nucleus that precedes complete cell division

2. The entire sequence of processes in cell division in which the diploid number of chromosomes is retained in both daughter cells

gah >.< I'm getting confused :?

~Toria
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Post by sdekivit » Mon Jul 31, 2006 6:14 pm

Toria wrote:1) There's a set of chromosomes - a red strand and a blue strand (which hold DNA) and they are duplicated so there's 2 strands of red and 2 strands of blue
2) They go into a process of separation


here is your answer: the chromosomes replicate formeing 2 chromatids each connected to the centromere. Notice that we only look at what happens in the prophase, where DNA-replication occurs in the S-phase.

--> so it's C.

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Post by Toria » Mon Jul 31, 2006 6:24 pm

Oh ... I see now ... when the chromosomes replicate they become chromatids. Then they are the same and that makes them sisters. That makes alot of sense. And it means I shouldn't doubt myself lol. GAH it makes too much sense now that I look back at it. Thank you soooo very much for the help :). It's been bugging me all day that I couldn't figure it out :P.

~Toria
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Post by nathalia_dejonge » Mon Jul 31, 2006 11:58 pm

where do the daughter cell come from?

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Post by Toria » Tue Aug 01, 2006 12:33 am

The daughter cells are what you get at the end of mitosis. You start off with 1 cell and then they go through mitosis and at the end you have 2 cells which would be the daughter cells (or diploid). I think that is right, please correct me if I'm wrong. :)

~Toria
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Post by sdekivit » Tue Aug 01, 2006 1:50 pm

Toria wrote:The daughter cells are what you get at the end of mitosis. You start off with 1 cell and then they go through mitosis and at the end you have 2 cells which would be the daughter cells (or diploid). I think that is right, please correct me if I'm wrong. :)

~Toria


sound OK to me :) remember that the daughter cells are identical (assuming no mutations in the DNA have occured)

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