| 单词 |
facultative heterochromatin |
| 释义 |
DictionarySeeheterochromatinfacultative heterochromatin
facultative heterochromatin[′fak·əl‚tād·iv ¦ hed·ə‚rō′krō·mə·tən] (genetics) Chromosomal material that may alternate in form and function between euchromatin and heterochromatin. facultative heterochromatin
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.fac·ul·ta·tive het·er·o·chro·ma·tinnonrepetitive heterochromatin that comprises translatable sequences of DNA. |
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