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'''Chromosomes''' (literally: ''colored bodies'', from [[Greek]]) 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''' (literally: ''colored bodies'', from [[Greek]]) 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 [[histone]]s that support the chromosome structure.<ref>http://ghr.nlm.nih.gov/handbook/basics/chromosome</ref>  The bound DNA units are called [[nucleosome]]s.

==Physical Characteristics of Chromosomes==

==Physical Characteristics of Chromosomes==

==Number of Chromosomes==

==Number of Chromosomes==

The chromosome number varies in different species. In humans there are 46 chromosomes, or 23 pairs of chromosomes (diploid), in every cell except the mature egg and sperm which have a set of 23 chromosomes (haploid).

The chromosome number varies in different species. In humans there are 46 chromosomes, or 23 pairs of chromosomes ([[diploid]]), in every cell except the mature egg and sperm which have a set of 23 chromosomes ([[haploid]]).

==Cell Division==

==Cell Division==