euchromatin
A chromosomal region that stains normally; thought to contain the normally functioning genes
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
Euchromatin versus Heterochromatin
The density of the chromatin that makes up each chromosome (that is, how tightly it is packed) varies along the length of the chromosome.
Euchromatin noun (and Euchromatic adjective) chromatin with a normal pattern of replication and gene expression. Compare with heterochromatin.
Euchromatin
Parts of chromosomes showing the normal cycle of condensation and normal staining properties at nuclear divisions (Gk. eu = true).
Euchromatin, which consists of DNA that is active, e.g., being expressed as protein.
Heterochromatin, which consists of mostly inactive DNA. It seems to serve structural purposes during the chromosomal stages.
Euchromatin is not tightly wound. It is active.
Example: Barr body
One X chromosome is inactivated in females by producing a tightly-wound structure called a Barr body.
euchromatin Part of the chromatin that takes up stain less than heterochromatin, contains active genes.
Euglenophyta A group of unicellular protists, usually green or colorless with two flagella per cell.
active genes in euchromatin, and inactive genes in heterochromatin
B.
amplification of some genes such as rRNA genes ...
Euchromatin -- the chromatin that shows the staining behavior characteristic of the majority of the chromosomal complement.
It is predicted to be very gene rich, with an estimated 2000 genes contained within ~60 Mb of euchromatin.
Euchromatin stains weakly and is more open (less condensed). Euchromatin remains dispersed (uncondensed) during Interphase, when RNA transcription occurs.
Euchromatin is the genetically active type of chromatin involved in transcribing RNA to produce proteins used in cell function and growth.
It exists in two forms: less dense euchromatin can be transcribed, and heterochromatin is highly condensed and cannot be transcribed. Inactive X chromosome of female mammals is an example of heterochromatin.
Beyond 30 nm fiber the structure of chromatin is poorly understood, but it is classically suggested that the 30 nm fiber is arranged into loops along a central protein scaffold to form transcriptionally active euchromatin.
 See also: Chromatin, DNA, Chromosome, Protein, Cell
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