A Barr body (named after discoverer Murray Barr) is the inactive X chromosome in a female somatic cell, rendered inactive in a process called lyonization, in those species in which sex is determined by the presence of the Y (including humans) or W chromosome rather than the diploidy of the X or Z. The Lyon hypothesis states that in cells with mult...
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http://en.wikipedia.org/wiki/Barr_body
(from the article `sex chromosome`) ...for this is that, in each somatic cell of a normal female, one of the X chromosomes is randomly deactivated. This deactivated X chromosome can be ... ...the paternal X, although the rationale for this preference is unclear. The inactivated X chromosome typically replicates later than other ... [...
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http://www.britannica.com/eb/a-z/b/24
The condensed single X-chromosome seen in the nuclei of somatic cells of female mammals. Base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.
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http://www.cat-world.com.au/glossary
Small dark staining inactivated X chromosome seen in female (XX) cells. According to the Lyon hypothesis, random inactivation occurs. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
a chromatin mass in the nucleus of somatic cells of females of most mammalian species, including humans. It represents a single, inactive, condensed X chromosome. Called also sex chromatin. See also Lyon hypothesis.
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http://www.encyclo.co.uk/local/21001
The condensed single x-chromosome seen in the nuclei of somatic cells of female mammals. Base pair a
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http://www.encyclo.co.uk/local/22391
Small dark-staining inactivated X chromosome seen in female (XX) cells. According to the Lyon hypothesis, random inactivation occurs.
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http://www.encyclo.co.uk/visitor-contributions.php
Barr body: A microscopic feature of female cells due to the presence of two X chromosomes in the female. One of these X chromosomes is inactive and is crumpled up to form the Barr body.
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http://www.medterms.com/script/main/art.asp?articlekey=2434
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