Chromosomes. Computer illustration of human chromosomes. Chromosomes are composed of deoxyribonucleic acid (DNA) and contain sections, called genes, which encode the body's genetic information. Each chromosome consists of two chromatids joined at their centres by the centromere, which is involved in cell division. At the tip of each chromatid are the telomeres, whose function is to protect the ends of the chromosome from degrading.
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