Essay Facultative Heterochromatin

Constitutive heterochromatin is a type of heterochromatin the cell, remaining in the condensed state throughout the cell cycle and during the development of the cell.

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Mitochondria are therefore often called the "power houses" of the cell.

Mitochondria have their own independent genome, the mitochondrial DNA.

Heterochromatin is further divided into constitutive heterochromatin, that which is present near the centromere and contains repetitive sequences that are never expressed, and facultative heterochromatin that may sometimes be expressed as proteins.

During interphase, the chromosomes are present as a tangle of both DNA and proteins and are not easily distinguishable.

Under normal conditions these arms are not clearly visible.

Eukaryotic cells also store genetic information in another organelle called the mitochondria, a small structure that supplies energy for the various processes that are carried out in the cells.Moreover, the inactivation of one of the two X chromosomes in the female somatic cells occurs by the formation of facultative heterochromatin.Moreover, facultative heterochromatin contains a type of repetitive sequences known as LINE-type repeated sequences.Generally, this type of heterochromatin is made up of highly repetitive DNA.Thus, constitutive heterochromatin does not get transcribed, but it plays a role in the chromosome structure.As the cell prepares for cell division (meiosis or mitosis), the chromatin strands start to condense and form short, thick thread-like structures. Each of the chromosomes takes on the classic four-armed structure with the centromere in the middle.The arms are called chromatids, the shorter of which is called the "p" arm and the longer arm "q".Moreover, centromeric and telomeric regions present throughout the cell cycle are examples of constitutive heterochromatin.They fold themselves to form highly compact structures.Steven Lazer Digital pathology is the viewing, analyzing, and managing of digitalized pathology slides with computer technology called whole slide imaging, or WSI, which generates a tremendous volume of data.A single whole slide image can be a gigabyte or larger in size.


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