Login

Join for Free!
116901 members


Cell division

Discussion of all aspects of cellular structure, physiology and communication.

Moderator: BioTeam

Cell division

Postby James » Thu Mar 17, 2005 10:58 pm

What are the prerequisites for cell division? What conditions/chemicals are needed for say, a root tissue to multiply? Also, what causes tissue to stop growing, how is the limit determined :?:
User avatar
James
King Cobra
King Cobra
 
Posts: 552
Joined: Wed Feb 23, 2005 11:00 pm
Location: England

Postby lohita » Sat Mar 26, 2005 4:12 am

:shock: prophase is the first step of cell division. the chromosomes at this stage starts douplecationing. when the cell get matured it stops growing. :o :D :P
User avatar
lohita
Death Adder
Death Adder
 
Posts: 84
Joined: Sat Mar 26, 2005 3:59 am
Location: canada (indian)

Postby MrMistery » Sat Mar 26, 2005 11:11 am

Cell division is a very complicated thing, James. Your question is really hard and I am stupid, that's why i will not answer it.
Here's a few things I think you may find helpfull:
Division is under control by different factors: internal and external, depending on the species of organism. For example, a bacteria divides whenever it can: in the propper conditions, the earth would be filled with bacteria in a number of days(a small one)
Before a cell can divide it needs to double the quantity of DNA, histonic and non-histonic proteins. The main controling mithosis in humans are your genes. When it is out of control=> cancer(if you want to know more about that maybe Poison will tell you)
Reagrds,
Andrew
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)


Postby Poison » Sat Mar 26, 2005 4:47 pm

Yes I can give info about cancer. If you want ....
It matters not how strait the gate
How charged with punishment the scroll
I am the Master of my fate
I am the Captain of my soul.
User avatar
Poison
Inland Taipan
Inland Taipan
 
Posts: 2322
Joined: Sun Jan 02, 2005 12:44 pm
Location: Turkey

Postby Linaeus » Fri Apr 08, 2005 10:07 pm

R u talking about meiosis or mitosis?? I'll tell you meisosis anyway :)

It starts with 4 chromosomes in the prophase where all the homologous chromosomes come together and form up 2 bivalents and the centrioles seperate and form a spindle .
next comes the metaphase, where the bivalents line up on the equator of the spindle.
after that in the anaphase they go opposit eachother.
then the telophase where the cytoplasm divides in 2.
now 2 cells are made. now the second prophase is beginning. again a spindle is made.
then the second metaphase. this time the chromosomes instead of the bivalents line up on the equator of the spindle. second anaphase: The 2 chromatids (a chromosome is made of 2 chromatids) divide. they move away from each other. now last but not least the second telophase where again cytoplasm divides and 4 cells are formed. each with half the chromosomes needed: 23!! (in a human)

I hope this answered your question!! Cause its all i now!! :D :D
User avatar
Linaeus
Garter
Garter
 
Posts: 9
Joined: Thu Apr 07, 2005 1:55 pm

Re: Cell division

Postby Poison » Sat Apr 09, 2005 2:21 pm

James wrote:What are the prerequisites for cell division? What conditions/chemicals are needed for say, a root tissue to multiply? Also, what causes tissue to stop growing, how is the limit determined :?:


I'm not sure but, water might be a factor. (if we are talking about root tissue)

By the way, root tissue has nothing to do with meiosis. :)
It matters not how strait the gate
How charged with punishment the scroll
I am the Master of my fate
I am the Captain of my soul.
User avatar
Poison
Inland Taipan
Inland Taipan
 
Posts: 2322
Joined: Sun Jan 02, 2005 12:44 pm
Location: Turkey

Postby mith » Sat Apr 09, 2005 4:28 pm

I think the length of the root is determined by the individual genetic data of an organism and also in determined by efficiency; once the root reaches a certain length, the energy required to sustain the root might outweight the additional benefits, kind of like the height limit of trees.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
User avatar
mith
Inland Taipan
Inland Taipan
 
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN

Postby James » Sun Apr 10, 2005 9:57 am

OK, thanx, unrelated but how much does the amount of ATP availble to a plant affect mitosis in the roots?
User avatar
James
King Cobra
King Cobra
 
Posts: 552
Joined: Wed Feb 23, 2005 11:00 pm
Location: England


Return to Cell Biology

Who is online

Users browsing this forum: No registered users and 0 guests

cron