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

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Chromatin is a of filamentous DNA
dispersed in the
forming euchromatin and
portions. Each
chromatin is a complete
(a DNA molecule,
double helix). Thechromatin the
human somatic is formed by
DNA molecules (22
chromosomes and 1pair sex
chromosomes).

In the cell prepares for
division and of DNA
molecules . The duplication of
DNA molecule forms identical
DNA double bound by a
called centromere. In phase each
identical of these pairsis
chromatid. It is during the
interphase the chromatids begin
condensate assuming the and
shorter shape of chromosome
illustrations. the phase of cell
cycle in DNA duplicatesis the
.

Some Biology textbooks the
chromosome a filament of
chromatin well as the
structure made of identical
chromatids after DNA duplication.
Rigorously pair of identical
bound in the are
two copies the same chromosome
therefore they are identical
chromosomes (and only one).