chromatin
n . 核染质,染色质
核染质,染色质
chromatin n 1 :
the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins ;
during mitotic division it condenses into chromosomes [
synonym :
{
chromatin }, {
chromatin granule }]
Chromatin \
Chro "
ma *
tin \,
n . (
Biol .)
The deeply staining substance of the nucleus and chromosomes of eukaryotic cells ,
composed of DNA and basic proteins (
such as histones ),
the DNA of which comprises the predominant physical basis of inheritance .
It was ,
at the beginning of the 20th century ,
supposed to be the same substance as was then termed {
idioplasm }
or {
germ plasm }.
In most eukaryotic cells ,
there is also DNA in certain plasmids ,
such as mitochondria ,
or (
in plant cells )
chloroplasts ;
but with the exception of these cytoplasmic genetic factors ,
the nuclear DNA of the chromatin is believed to contain all the genetic information required to code for the development of an adult organism .
In the interphase nucleus the chromosomes are dispersed ,
but during cell division or meiosis they are condensed into the individually recognizable chromosomes .
The set of chromosomes ,
or a photographic representation of the full set of chromosomes of a cell (
often ordered for presentation )
is called a karyotype .
[
Webster 1913 Suppl .]
Chromatin \
Chro "
ma *
tin \,
n . [
Gr . ?, ?,
color .]
1 . (
Biol .)
Tissue which is capable of being stained by dyes .
[
archaic ]
[
1913 Webster ]
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