heterochromatin

het·er·o·chro·ma·tin

H0174500 (hĕt′ə-rō-krō′mə-tĭn)n. Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive.

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

het•er•o•chro•ma•tin

(ˌhɛt ər əˈkroʊ mə tɪn)

n. the dense, highly stainable part of a chromosome. [1930–35]

Heterochromatin

heterochromatin

[¦hed·ə·rō′krō·məd·ən] (cell and molecular biology) Specialized chromosome material which remains tightly coiled even in the nondividing nucleus and stains darkly in interphase.

Heterochromatin

portions of the chromosomes that remain thickened in the interval between cell divisions, that is, in the interphase (as opposed to other portions called euchromatin). Heterochromatin is sometimes closely associated with the nucleolus, forming a sort of ring or casing around it. During mitosis the heterochromatin is colored more or less darkly than the euchromatin (the phenomenon of positive or negative heteropycnosis). Heterochromatin is especially characteristic of sex chromosomes of many animal species. Heteropycnotic areas can be obtained experimentally, for example, through the action of low temperature. It is theorized that heterochromatin does not contain genes that control the development of the organism.

M. E. ASPIZ

heterochromatin

enUK

heterochromatin

[het″er-o-kro´mah-tin] that state of chromatin in which it is dark-staining, genetically inactive, and tightly coiled.constitutive heterochromatin the chromatin in regions of the chromosomes that are invariably heterochromatic; it contains highly repetitive sequences of DNA that are genetically inactive and serves as a structural element of the chromosome.facultative heterochromatin the chromatin in regions of the chromosomes that become heterochromatic in certain cells and tissues; for example, it makes up the inactive X chromosome in female somatic cells.

het·er·o·chro·ma·tin

(het'ĕr-ō-krō'mă-tin), The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily. Synonym(s): heteropyknotic chromatin

heterochromatin

(hĕt′ə-rō-krō′mə-tĭn)n. Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive.

het·er·o·chro·ma·tin

(het'ĕr-ō-krō'mă-tin) The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily.

heterochromatin

A length of chromatin in the genome that is permanently highly condensed and whose DNA is not transcribed.

heterochromatin

any chromosomal segments or whole chromosomes that appear darkly stained during interphase of the CELL CYCLE (as compared to EUCHROMATIN) due to tight condensation, which may indicate genetic inactivity. Hetero chromatin may be condensed at all times (constitutive) or only at certain times (facultative). see C-BANDING.

单词	heterochromatin
释义	heterochromatin enUK het·er·o·chro·ma·tin H0174500 (hĕt′ə-rō-krō′mə-tĭn)n. Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive. 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 het•er•o•chro•ma•tin (ˌhɛt ər əˈkroʊ mə tɪn) n. the dense, highly stainable part of a chromosome. [1930–35] Heterochromatin enUK heterochromatin [¦hed·ə·rō′krō·məd·ən] (cell and molecular biology) Specialized chromosome material which remains tightly coiled even in the nondividing nucleus and stains darkly in interphase. Heterochromatin portions of the chromosomes that remain thickened in the interval between cell divisions, that is, in the interphase (as opposed to other portions called euchromatin). Heterochromatin is sometimes closely associated with the nucleolus, forming a sort of ring or casing around it. During mitosis the heterochromatin is colored more or less darkly than the euchromatin (the phenomenon of positive or negative heteropycnosis). Heterochromatin is especially characteristic of sex chromosomes of many animal species. Heteropycnotic areas can be obtained experimentally, for example, through the action of low temperature. It is theorized that heterochromatin does not contain genes that control the development of the organism. M. E. ASPIZ heterochromatin enUK heterochromatin [het″er-o-kro´mah-tin] that state of chromatin in which it is dark-staining, genetically inactive, and tightly coiled.constitutive heterochromatin the chromatin in regions of the chromosomes that are invariably heterochromatic; it contains highly repetitive sequences of DNA that are genetically inactive and serves as a structural element of the chromosome.facultative heterochromatin the chromatin in regions of the chromosomes that become heterochromatic in certain cells and tissues; for example, it makes up the inactive X chromosome in female somatic cells. het·er·o·chro·ma·tin (het'ĕr-ō-krō'mă-tin), The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily. Synonym(s): heteropyknotic chromatin heterochromatin (hĕt′ə-rō-krō′mə-tĭn)n. Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive. het·er·o·chro·ma·tin (het'ĕr-ō-krō'mă-tin) The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily. heterochromatin A length of chromatin in the genome that is permanently highly condensed and whose DNA is not transcribed. heterochromatin any chromosomal segments or whole chromosomes that appear darkly stained during interphase of the CELL CYCLE (as compared to EUCHROMATIN) due to tight condensation, which may indicate genetic inactivity. Hetero chromatin may be condensed at all times (constitutive) or only at certain times (facultative). see C-BANDING.
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