Heterochromatin is a tightly packed form of DNA has multiple varieties. It’s divided into two types they are constitutive heterochromatin and facultative heterochromatin. Both play a role in the expression of genes.
Repeated DNA sequence is called chromosomal rearrangements. They are arranged in unique region of the chromosome called the centromere. This tightly-coiled DNA and proteins, can suppress the chromosomal rearrangements. Heterochromatin has been used in gene regulation and in protection of chromosomal function.
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