answersLogoWhite

0


Best Answer

tor matha ar amar mundu

User Avatar

Wiki User

12y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What is the function of heterochromatin?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is condensed visible form of chromatin?

Heterochromatin Heterochromatin is a tightly packed form of DNA or condensed DNA, which comes in multiple varieties. These varieties lie on a continuum between the two extremes of constitutive heterochromatin and facultative heterochromatin. Both play a role in the expression of genes.


Interaction between 'cold spots' and heterochromatin?

Chromosomes contain what are known as cold spots, where meiotic recombination happens at a lower rate. This is thought to be caused by a more condensed state of heterochromatin in the centromere, which is often a site of many such cold spots.


Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?

These condensed regions are called heterochromatin. This tightly packed DNA is less accessible for gene expression compared to euchromatin, which is less condensed and more transcriptionally active. Heterochromatin plays a role in maintaining chromosome structure and gene regulation.


What are loosely coiled fibers containing protein and DNA within nucleus?

Chromatin is the generic term for DNA (not "fiber") wound around proteins called histones. From the description you've given, it sounds like you're talking about euchromatin.There are generally two types of chromatin: euchromatinand heterochromatin. Under the microscope, heterochromatin tends to stay at the periphery of the nucleus, while euchromatin tends to stay central in the nucleus. Also microscopically, euchromatin is a bit lighter (ie, it doesn't stain as heavily) than heterochromatin, reflecting the fact that euchromatin is less dense than heterochromatin. The decreased density has to do with euchromatin being loosely wound around histones, whereas heterochromatin is wound rather tightly. Heterochromatin also has a number of other chromatin-modifying proteins around that prevent it from coming undone easily.The functional difference between the two types of chromatin has to do with how effectively DNA transcription (the process by which DNA is transcribed to RNA) can occur. The dense heterochromatin is so tightly wound and so tightly packed with associated proteins that the DNA transcription machinery can't get access to the DNA contained within the heterochromatin. Only the loosely wound euchromatin will permit the machinery to gain access to its DNA. Therefore, generally euchromatin contains DNA that is being actively transcribed, while heterochromatin is transcriptionally silent.THE ANSWER IS CHROMATIN!!


Some of the portions of the chromatin are permanently condensed so that their DNA is never expressed All of these portions stain very intensely and are given a common name of?

These condensed portions of chromatin are called heterochromatin. They are tightly packed regions of DNA that are typically transcriptionally inactive, meaning the genes within them are not actively expressed. Heterochromatin appears densely stained under a microscope due to its tight packing of DNA.


How are euchromatin and heterochromatin stained?

Euchromatin is loosely coiled DNA that is transcriptionally active. An increased amount of euchromatin indicates an active cell. Heterochromatin is tightly packed DNA that is transcriptionally innactive.


Are Genes present in heterochromatin readily expressed?

No. Heterochromatic regions of DNA are not readily expressed as they are densely packaged. Some of these regions do not code for genes at all.


Barr bodies at the edge of the typical cell nucleus as well as the drumstick appendages in the nuclei of neutrophils from a blood sample represent the?

inactive heterochromatin of cells from a female


What is Tightly coiled form of DNA called?

Coiled up DNA, combined with protein histone, forms chromosomes.


What is the the relationship of chrosomes to chromatin?

Chromatin is the stuff they´re made out of. Densely condensed chromatin is known as heterochromatin and not fit to transcribe, loosely packed euchromatin can be transcribed easily.


Which regions of the chromosomes will typically be in the form of hereochromatin?

There are certain regions that are tightly coiled. When the DNA is stained with a dye these regions appear in a dark band and are called hetrochromatin. They are the part of the chromosome that are not actively expressed in the cells. A heterochromatin in one cell may be functional in other cells.


How do DNA methylation and histone acetylation affect chromatin structure and the regulation of transcription?

When chromatin is tightly compacted and dense, it's called Heterochromatin. When chromatin is loosely packed, its called Euchromatin. Euchromatin is easily accessible to transcription enzymes, while herterochromatin makes transcription impossible because the enzymes cannot access the DNA. Therefore, a gene within heterochromatin cannot be expressed. Also, look up how histone modifications such as histone acetylation affect gene expression.