Heterochromatin is a tightly packed form of DNA, which comes in different varieties. These varieties lie on a continuum between the two extremes of constitutive and facultative heterochromatin. Both play a role in the expression of genes, where constitutive heterochromatin can affect the genes near them (position-effect variegation) and where facu...
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http://en.wikipedia.org/wiki/Heterochromatin
Dark-stained regions of chromosomes thought to be for the most part genetically inactive.
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http://www.encyclo.co.uk/local/20095
<cell biology, genetics> The chromosomal regions that are condensed during interphase and at the time of nuclear division. ... They show what is considered an abnormal pattern of staining as opposed to euchromatin. Can be subdivided into constitutive regions (present in all cells) and facultative heterochromatin (present in some cells only). ...
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http://www.encyclo.co.uk/local/20973
(het″әr-o-kro´mә-tin) the form of chromatin that is dark-staining, genetically inactive, and tightly coiled. See also euchromatin. constitutive heterochromatin the chromatin in regions of the chromosomes that are invariably heterochromatic; it contains highly repetitive ...
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http://www.encyclo.co.uk/local/21001
The chromosomal regions that are condensed during interphase and at the time of nuclear division. They show what is considered an abnormal pattern of staining as opposed to euchromatin. Can be subdivided into constitutive regions (present in all cells) and facultative heterochromatin (present in some cells only). The inactive X chromosome of female mammals is an example of facultative heterochromatin.
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http://www.encyclo.co.uk/visitor-contributions.php
Type: Term Pronunciation: het′ĕr-ō-krō′mă-tin Definitions: 1. The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily. Synonyms: heteropyknotic chromatin
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http://www.medilexicon.com/medicaldictionary.php?t=40727
Heterochromatin: Chromosomal material that is darkly staining and tightly coiled throughout the cell cycle and that is, for the most part, genetically inactive. There are two types of heterochromatin: constitutive heterochromatin and facultative heterochromatin. Constitutive heterochromatin is fixed and irreversible in form and function. Chromosome...
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http://www.medterms.com/script/main/art.asp?articlekey=3736
(het;ue-ro-kro;mua-tin) A condensed, inactive form of chromatin.
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http://www.mhhe.com/biosci/abio/glossary.mhtml
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