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Achromosomeis an organized package of DNA found in the nucleus of the cell.Differentorganisms havedifferentnumbers ofchromosomes. Humans have 23 pairs ofchromosomes--22 pairs of numberedchromosomes, called autosomes, and one pair of sexchromosomes, X and Y.
Deoxyribonucleic acid is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. DNA and ribonucleic acid are nucleic acids.
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