Length of Human DNA.

DJ Dirk dj_dirk at bigfoot.de
Tue Dec 2 11:42:26 EST 1997


Ivan Moller schrieb:

> > How many nucleotides are in human DNA?
> > And, is the number of nucleotides in human DNA constant across
> humans
> > Is that number close? 6 billion? Or are there much more or much
> less?
> > I read in a book that there were 200,000 genes in human DNA, and it
> said
> > 1000 nucleotides per gene, which has to be an approximation, right?
> Since
> 3
> > nucleotides gives you an amino acid, wouldn't the number of
> nucleotides
> in a
> > gene have to be evenly divisible by 3?
> >
> > But by that calculation, 200 million base pairs approximately in a
> human
> > DNA?
>
> The correct size of the human genome is 2.8 bilion base pairs (two
> nucleotides)
>
> Your calculation assumes that the DNA only consists of genes, like
> pearls
> on
> a string, which is not correct.
> Yes, the number of base pairs that encodes the protein is divisible by
> 3.
>
> >
> > How do we know that introns are non functional? Introns exist within
> a
> > gene, right?
>
> All we know is that they don't encode the final protein, as they are
> spliced out of the messenger RNA, than encodes the protein.
>
> > Not junk outside of start and stop codons, right?
>
> No, it's inside the start and stop codon.

I think you'll find further informations under:

http://www.gene.com/

http://www.ornl.gov/TechResources/Human_Genome/home.html

http://www.nhgri.nih.gov/HGP/

so far
DJ Dirk





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