Eukaryotic Chromosomes


             chromosome.gif (941 bytes)         
               A chromosome is the entire strand of a chromatid
           DNA is packed and coiled into chromosomes               
                 

                centrome.gif (497 bytes)
A chromosome's  centromere is the center
of the chromosome where duplicated chromatids are attached.

 

A nucleosome is the structural unit of a eukaryotic chromosome.  It is composed of histones and DNA. 
Histones
are proteins that form the core of the nucleosome.

nucleosome.gif (996 bytes)

chromatid.gif (756 bytes)
A chromatid is the individual half of a "duplicated" chromosome.

      chromatin.gif (559 bytes)
           Chromatin is a coiled, looped chain of nucleosomes. 
  It is the complex of DNA and proteins in a chromosome.
  

 

centriole.gif (311 bytes)                
Centrioles are microtubule structures that serve as attachment points in mitosis.  Two centrioles make up a centrosome.             

 

                 centrosome.gif (377 bytes)
             A centrosome is composed of two centrioles.
Centrosomes are used in mitosis to help organize chromosomal movement.

 

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