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What is the function of heterochromatin?

Updated: 4/28/2022
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Q: What is the function of heterochromatin?
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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?

Cold spots on chromosomes, which are regions with lower recombination rates, are often associated with heterochromatin. Heterochromatin is a tightly packed form of DNA that is transcriptionally silent. The presence of heterochromatin can contribute to the reduction in recombination rates, leading to the formation of cold spots. The interaction between cold spots and heterochromatin can influence genetic diversity and the distribution of genetic variants along the chromosomes.


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

Heterochromatin is dark stained area caused by condensed chromosomes or DNA. Heterochromatin is located near between the inner membrane and the nucleoplasm.


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!!


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.


What feature of the chromosome complement is reduced int the first meiotic division and kept equal in the second?

Heterochromatin


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.


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?

Heterochromatin


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.


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.