Changes

Chromosomes are packaged units of [[DNA]] and associated proteins.<ref>http://learn.genetics.utah.edu/units/disorders/karyotype/whatarechrom.cfm</ref> The chromosome carries portions of the hereditary information of an organism.  The DNA is tightly coiled many times around proteins called [[histones]] that support the chromosome structure.<ref>http://ghr.nlm.nih.gov/handbook/basics/chromosome</ref>  The bound DNA units are called [[nucleosomes]].

'''Chromosomes''' are packaged units of [[DNA]] and associated proteins.<ref>http://learn.genetics.utah.edu/units/disorders/karyotype/whatarechrom.cfm</ref> The chromosome carries portions of the hereditary information of an organism.  The DNA is tightly coiled many times around proteins called [[histones]] that support the chromosome structure.<ref>http://ghr.nlm.nih.gov/handbook/basics/chromosome</ref>  The bound DNA units are called [[nucleosomes]].

==Physical Characteristics of Chromosomes==

==Physical Characteristics of Chromosomes==