heterochromatin

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het·er·o·chro·ma·tin

 (hĕt′ə-rō-krō′mə-tĭn)
n.
Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

heterochromatin

(ˌhɛtərəʊˈkrəʊmətɪn)
n
(Biology) the condensed part of a chromosome that stains strongly with basic dyes in nondividing cells and has little genetic activity. Compare euchromatin
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

het•er•o•chro•ma•tin

(ˌhɛt ər əˈkroʊ mə tɪn)

n.
the dense, highly stainable part of a chromosome.
[1930–35]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Through rDNA, the distribution pattern and constitutive heterochromatin regions between morphotypes can be described and compared (Zheng, 2015).
nasutus from different countries, because all specimens showed the same karyotype, the same morphological characteristics for the autosomes and sex chromosomes and the same pattern of constitutive heterochromatin (Table 1).
C-banding of mitotic metaphase revealed constitutive heterochromatin blocks (thin C-bands) in the paracentromeric region in most chromosomal elements, with the exception of one small pair of autosomes (thick C-bands).
CBG-banding (Figure 1) in ACU revealed constitutive heterochromatin in the centromeric regions of all chromosomes, except in pair 5 and in the Y chromosome.
Approximately 15-20% of this non-coding part of human DNA is constitutive heterochromatin. There are two types of constitutive heterochromatin: C- and Q-heterochromatin.
The researchers looked in detail at the mysterious tightly packed portions of the genome, called constitutive heterochromatin.
2011), the principal component of the constitutive heterochromatin. The C-banding technique confirmed the low amount of heterochromatin when using modern genome sequencing techniques.
By using C-banding constitutive heterochromatin regions were observed on the centromeres of several chromosomes in all species.
Constitutive heterochromatin and nucleolus organizer regions (NORs) were detected by the techniques of C-banding [25] and silver staining of nucleolar organizer regions [26], respectively.
Trimethylated H3K9 (H3K9me3) is a highly conserved histone post-translational modification and is commonly linked to both facultative and constitutive heterochromatin formation and transcriptional repression.
C-band results showed that all constitutive heterochromatin was confined to the X chromosome, differing from the pattern observed in Cavia and Galea.
Detection of constitutive heterochromatin (C-banding) was performed according to Sumner (1972), with some minor modifications.