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Mitosis Help..

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Mitosis Help..

Postby ScottishKevin » Wed Jun 01, 2005 5:17 pm

Hey! I know this question is a little "amateurish", and you are all used to answering much more complex questions, but as I have just started my Higher Biology Course, on the topic "Cells", I would like to be clear on the stages of Mitosis.

To make myself clearer- I know that Mitosis is Cell Division, and I can see in my head the different stages that it goes through, but if someone could please put it into words that I could revise I would be more than thankful. I just need to remember it as it's one of the things in Biology I have the most trouble remembering.

Thanks,
Kevin.
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Postby biostudent84 » Wed Jun 01, 2005 11:26 pm

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Postby ScottishKevin » Thu Jun 02, 2005 4:04 pm

Thanks a lot! That really helped!
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Postby th1_rhs13 » Fri Jun 03, 2005 3:52 am

That is actually missing the Interphase portion of Mitosis. Which is prior to Prophase of Mitosis.


And not to complicate matters but this is also immplemented in the first stage of Misosis (AKA Miosis 1). Mitosis is also an A sexual reproduction just FYI. Basic I know, but youo know just in case.
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Postby MrMistery » Sat Jun 04, 2005 9:10 am

The cell cycle contains 2 parts: interphase(90%) and division(10%). Therefore, interphase is not part of mitosis
th1_rhs13 wrote:Mitosis is also an A sexual reproduction just FYI

What do you mean by that?
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Postby th1_rhs13 » Mon Jun 06, 2005 6:01 am

How so?

The "holding" part of Mitosis, is still aprraent and a vital part of Mitosis. Its prior to the prophase, the chromosomes that will soon be condensed, are not yet visible.

A sexual- meaing it doens't perpuetate/create any sexual reproductive cells (Sperm/Egg). It is used to create cells for growth/repair (such as oh, liver cells).

I'm currently studying for my Lecture and Lab final. In fact I have my Notes right in front of me, and although it is not noted (I'm a Bilogy major) I spoke with my Lab instructor and talked about the matter. All 5 (6, if you count prometa phase) are vital parts of Mitosis. Although she is Pre-med (I'm not) its still a valid claim. Inter-Pro-(possibly) Prometa- Meta-Ana-Telophase.

How does one actually summerize the view of an intriquete and neccessary process by simplying sttaing "90% this or 10% that?", those assertions leave one with a rather unfilfiling view of just how elobortae the system (cell reproduction) is. These assertions are rather perplexing. Or am I missing somthing?

With that said, I await your rebuttle or contrasting view. For mere enlightening purposes of course, nothing personal.

Ps: would anyone possess any information about CNS (Central Nervous system) studies, or lab or classes offered? Possible requirements. Possibly offered in the Southern California area. Thanks!
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Postby MrMistery » Mon Jun 06, 2005 7:54 pm

Ok... Look, this is a very complex process. The process as a whole is the cell cycle. Based on experimental data, it has been divided into 2 sections: interphase and division. The cell division has been separated through the interphase for a long time now, based on experimental data at first: people saw that cell was getting bigger at the time. Later people understood what exactly happenes inside the cell at that time. Just out of curiosity i looked in the alberts book: it has more than 400 pages on cell division. The subject is clearly too complex to be presented on the forum.
Campbell, Alberts and all my 9th grade books divide the cell cycle like this: interphase-90% and division-10%
Now, of course the number vary: a stem cell or a meristem divides frequently, while a neuron does not divide at all. I guess they avareged it up and got that 90% interphase.
It is true that in the interphase DNA is replicated and enzymes are synthesised(wherefrom we came up with the G1, S and G2 stages) but that is still called interphase and it is different from division. Saying that interphase is a part of mythosis is like saying that an athlete's warm-up is part of the competition: it is true that he has to do it, but he is not gradet for it... Ok, maybe that wasn't such a good analogy
Anyway, what you need to understand is that these clsifications did not come from god: the phenomen is a circular one, and each stage influences the next. But to make it easier people have clasified it like this. It is not our job to say if the clasification is good or not
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Postby th1_rhs13 » Mon Jun 06, 2005 8:08 pm

I read that post 3 times prior to conjuring up any kind of staement towards it.

Are you sayng that disregarding the several stages of Mitosis is an accepted approach? On the pretense that is is divided in such a manner in your "9th grade books'' ? Perhaps, you are asking the poster to recognize the system in a more simplistic manner? I would actually advice against that, as it will later hinder you while trying to understand any other proces. Just my humble opinion.

Im really left in a conflicted state. What are you trying to say? Are we still speaking of Mitosis becuase I am not aware of any process named "mythosis" I'm sure it was just a spelling error, I just need clarification.

Again, I'm just trying to understand and not condescend.

Ps; Please refrain from looking at this in anything other than an objective topic, the use of God's will or presence is neither relevent nor apt.
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Postby MrMistery » Mon Jun 06, 2005 8:51 pm

First of all, mythosis=mitosis.
Now, about our little debate
Campbell, Alberts and all my 9th grade books divide the cell cycle like this: interphase-90% and division-10%

Have you ever actually looked at Campbell or Alberts books? They are each 1200 pages long. Alberts book is exclusevly on the cell and it's functions, while Campbell is general. Both are required in order to qualify for IBO, and, even though I failed to qualify this year i have studied them for a while
Actually, mitosis is divided into prophase, prometaphase, metaphase, proanaphase, anaphase(some books even mention a postanaphase) and telophase. These are it's stages. A qoute from a university cellular biology i found in the library(i forgot i had that book-though i lost it): "Mitosis begins after G2 stage of interphase, with prophase"
Regards,
Andrew
PS: the only info i cyte is(in my opinion of course)accurate, even if it is from a 9th grade textbook. This is not a simplistic view of the subject but the view found everywhere
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