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Constitutive heterochromatin

Constitutive heterochromatin

(Science: protein) regions on chromosomes which are permanently condensed and genetically inactive in every cell in the body. The condensed portions are always in the same position on both homologous chromosomes. An example is the centromeres.

Compare: facultative heterochromatin.

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Centromeres in a resting nucleus

Please take a look at this statement: Centromeres appear as constitutive heterochromatin in a resting nucleus. Is that true? Does that mean that the centromere sequences ...

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by Adz795
Sun Dec 04, 2011 9:55 am
Forum: Cell Biology
Topic: Centromeres in a resting nucleus
Replies: 3
Views: 2059

i need an illustration

... Now for the phases: G1 - no chromosomes are formed, only uncondensed heterochromatin exist, which cannot be seen by the naked eye. In contrast, constitutive chromatin cannot decondense, so these regions are visible; however, I doubt your ...

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by majik1213
Fri Jun 30, 2006 4:39 pm
Forum: Cell Biology
Topic: i need an illustration
Replies: 1
Views: 1967


... which consists of DNA that is active, e.g., expressed as protein. Heterochromatin, which consists of mostly inactive DNA. It seems to serve ... stages. Heterochromatin can be further distinguished into two types: Constitutive heterochromatin, which is never expressed. It is located around ...

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by ginny
Tue Aug 09, 2005 8:16 pm
Forum: Cell Biology
Topic: mithocondria, bacteria&chromosomes
Replies: 14
Views: 12649

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