WHAT IS A CHROMOSOME

William R. Pearson wrp at dayhoff.med.Virginia.EDU
Mon Feb 7 12:16:53 EST 1994


In article <1994Feb7.135013.16931 at alw.nih.gov>,
Jim Owens  <jow at helix.nih.gov> wrote:
>In article <CKoDyn.Ant at ucdavis.edu> , szdbates at chip.ucdavis.edu writes:
>>Single piece of DNA (double stranded) = chromatid
>>Pair of chromatids = Chromosome.


>So now I have a question about this thread:  Has it been proved that
>eucaryotic chromatids have just one very, very long molecule of DNA?  The
>last I read, in 1978, said this was _assumed_ to be the case, but it was
>not proven.  It was considered possible that there could be a series of
>long or very long DNA molecules in a chromatid.

	In the mid-1970's, Bruno Zimm showed that there are
chromosome-sized DNA molecules in drosophila by viscometry.

Bill Pearson



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