Explain the concepts of chromosome, Biology

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How are the concepts of chromosome, chromatin and chromatids related? In which phase of the cell cycle does DNA duplicate?

Chromatin is a set of filamentous DNA molecules dispersed in the karyoplasm forming euchromatin and heterochromatin portions. Every chromatin filament is a complete chromosome (a DNA molecule, or double helix). The chromatin of the human somatic cell is produced by 46 DNA molecules (22 homologous chromosomes and 1 pair of sex chromosomes).

 


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