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SlideshowReport

Chromosomes and the DNA molecule

Description
In human cells, DNA is aligned along 23 paired chromosomes. Numbers 1 22 are common to both males and females. Chromosome 23 is sex linked, with males having the XY pattern and females the XX pattern. The nucleus of a cell contains copies of each chromosome. Chromosomes are composed of the genes arranged in the familiar double helix—a long strand of DNA molecules.
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