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13 Cards in this Set
- Front
- Back
heterochromatin
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bands that appear dark when stained
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euchromatin
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bands that appear light when stained
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constitutive heterochromatin
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chromosomal regions that remain condensed in heterochromatin at most times in all cells
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autoradiograph
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an image on an x-ray film or nuclear emulsion produced by the pattern of decay emissions (e.g., beta particles or gamma rays) from a distribution of a radioactive substance
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_______ contains most of the sites of transcription and thus almost all of the genes
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euchromatin
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variegating
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to make varied in appearance, as by adding different colors.
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position-effect variegation
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variable expression of a gene in a population of cells, caused by the gene's location near highly compacted heterochromatin
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facultative heterochromatin
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regions of chromosomes (or even whole chromosomes) that are heterochromatic in some cells and euchromatic in other cells of the same organism
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Does heterochromatin skip over genes as it spreads along the chromosomes?
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NO!!!
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Is it known how heterochromatin invades euchromatin?
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Not really...
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Barr bodies
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darkly stained heterochromatin masses
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What does Xist stand for?
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X inactivation specific transcript
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What's the function of the Xist gene?
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to produce a unusually large cis-acting RNA transcript
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