Chromatin or chromosomes?

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderators: Leonid, amiradm, BioTeam

Post Reply
biostudent203
Garter
Garter
Posts: 8
Joined: Sat Sep 10, 2005 1:56 pm

Chromatin or chromosomes?

Post by biostudent203 » Tue Sep 20, 2005 1:02 am

My bio teacher said that chrmosomes are formed from shortened chromatin. But my text book says it's the other way around. Could someone please explain? :?

ERS
Inland Taipan
Inland Taipan
Posts: 137
Joined: Thu Dec 16, 2004 5:13 am

Post by ERS » Tue Sep 20, 2005 2:11 am

think of it this way, DNA strands are associated with protiens to help maintain chromosome structure, etc. Thus we are talking about a DNA-protein complex. Chromatin is long-thin strands of the DNA-protein complex and is found in a loosley packed formation, while the individual chromosomes are formed by a tighter packing, via coiling and compact folding, of the DNA-protein complex and are thus visible.

Think of the chromatin form as a big wad of spaghetti noodles where you can't distinguish each noodle from each other, and the chromosome form as each individual noodle untangled from the mass and laid out. Same material, just different form depending on where you are at in the cell cycle.

Does this help? does anyone else have anything to add?
ERS

User avatar
rosebud
Garter
Garter
Posts: 22
Joined: Sun Sep 18, 2005 1:33 pm

Post by rosebud » Tue Sep 20, 2005 12:07 pm

What I have been taught is that chromatin forms chromosomes.

User avatar
Navin
Coral
Coral
Posts: 277
Joined: Thu Jun 09, 2005 2:23 pm
Location: Singapore (Asia Pacific)

Post by Navin » Tue Sep 20, 2005 1:30 pm

Chromatin compress together to give fat chromosomes. (I think chromosomes only appear during cell division)
Attachments
Picture in Scrap.jpg
Picture in Scrap.jpg (28.96 KiB) Viewed 20781 times

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Tue Sep 20, 2005 7:18 pm

Yes, that is true. That is why, if we want to study a cariotype, we need to treat the cell with colchicine buring metaphase.
"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

vinaya
Death Adder
Death Adder
Posts: 78
Joined: Tue Sep 06, 2005 2:17 pm

Post by vinaya » Wed Sep 21, 2005 3:49 pm

i think u r getting confused between chromatin and chromatid
one half of a chromosome is referred to as a chromatid .so ur teachers bang on target if she said two chromatids comprise a chromosome
a network of chromosomes is called a chromatin network. during cell division, the chromosomes single out and line up
And its good u can recollect enough to get confused :wink: :wink:
most people would just follow the text :D :lol:

biostudent203
Garter
Garter
Posts: 8
Joined: Sat Sep 10, 2005 1:56 pm

Post by biostudent203 » Thu Sep 22, 2005 12:28 am

Thanx. I understand now. :)

Post Reply

Who is online

Users browsing this forum: Google Adsense [Bot] and 2 guests