Qualification > Sciences
Biology CIE
nid404:
--- Quote from: lolo93 on April 20, 2010, 08:21:06 am ---ok Thanks
+rep
--- End quote ---
u still haven't got it...have you?
I'll sent you some links if u need
*Hope*:
--- Quote from: nid404 on April 20, 2010, 08:25:08 am ---u still haven't got it...have you?
I'll sent you some links if u need
--- End quote ---
ok the truth is am kinda still confused cuz in the book they say at the interphase, after DNA replication, the chromosome has 2 DNA molecules so it means that before DNA replication, each chromosome has 1 DNA molecule. But any wayz some links from u will help insA ;)
nid404:
http://www.youtube.com/watch?v=s9HPNwXd9fk
watch this
tmisterr:
let me give it a try,
When a cell in not replicating, in interphase stage that is, It has 46 chromatins. these are long and thin and are not easily visible. Each Chromatin is one strand of D.N.A. So when the cell is receives signals to divide, each D.N.A molecule (each Chromatin) replicates and forms two D.N.A helices one in each of two chromatids joined at the centromere (so each chromatin splits in two chromatids). Each chromatid contains an identical copy of D.N.A and two sister Chromatids (that is containing the same D.N.A) joined at the centromere form a chromosome. So each chromosome contains two chromatids each with a D.N.A helix making each Chromosome to have 2 D.N.A helices.
nid404:
--- Quote from: tmisterr on April 20, 2010, 03:20:20 pm ---let me give it a try,
When a cell in not replicating, in interphase stage that is, It has 46 chromatins. these are long and thin and are not easily visible. Each Chromatin is one strand of D.N.A. So when the cell is receives signals to divide, each D.N.A molecule (each Chromatin) replicates and forms two D.N.A helices one in each of two chromatids joined at the centromere (so each chromatin splits in two chromatids). Each chromatid contains an identical copy of D.N.A and two sister Chromatids (that is containing the same D.N.A) joined at the centromere form a chromosome. So each chromosome contains two chromatids each with a D.N.A helix making each Chromosome to have 2 D.N.A helices.
--- End quote ---
thanks...that ws well explained...unlike mine...AS has taken a toll on me
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