Answer to Question #102561 in Biochemistry for Nadine

Question #102561
What are the in depth differences of chromatin, chromatid, and chromosome?
1
Expert's answer
2020-02-10T08:19:34-0500

Chromatin is a complex of DNA and proteins (mainly histones). These complexes form extended (euchromatin) or condensed (heterochromatin) fibers. Chromatin fiber represents a form of DNA condensation produced by the compactization of nucleosomes. Although DNA is compacted in chromatin it can be transcribed and replicated.

A chromosome is formed of a highly condensed chromatin. As a result, chromosomes can be defined as the highest level of DNA condensation that results in the formation of single-stranded condensed chromatin composed of a single DNA molecule and numerous proteins.

Following DNA replication, a chromosome consists of two identical highly compacted strands attached to each other in the centromere region. These two DNA strands are called chromatids.

As a result, a chromosome is a highly compact form of chromatin, whereas chromosomes may consist of one strand or two identical DNA strands called chromatids.


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