what is the difference between a chromatid and chromatin?

Answer 1

Short answer: a chromatid is made up of chromatin.

In-depth answer:

A CHROMOSOME is that X-shaped bundle of genetic material, right? Well, you probably remember from class that a chromosome is actually made up of two complete sets of the genetic information it is supposed to contain.

A CHROMATID is part of that chromosome. There are two chromatids in the chromosome, each forming one side of the "X," and they're attached together to form the complete "X"

CHROMATIN is DNA plus protiens, but doesn't have to be wound up tightly into the chromatid/chromosome. In all the stages of the cell cycle where the genetic material is lose, not packed into chromosomes, the material is called chromatin. Once it is bundled into chromosomes, people stop calling it chromatin because they can be more specific.

If you want more information, go to http://en.wikipedia.org/wiki/Chromatin
and
http://en.wikipedia.org/wiki/Chromosome

If that isn't enough, you can probably find a pop science website that can explain it in relatively simple terms (I know I absolutely hate reading textbooks and the really in-depth science websites when I'm first trying to understand something)

I hope I helped.

Answer 2

simple answer:
chromatid more condensed than chromatin
Complete answer:
none knows completely the molecular complex involved in condensation and decondensation (due to dna transcription) of dna.
Read about it on a good molecular biology book like Cooper or Alberts (molecular biology of the cell)

Answer 3

chromatids r d arms[seperated by centromere] whereas chromatin r d fibres
as far i thnk!!!!!!!!!!