ADRIAN T SUMNER / SCIENCE PHOTO LIBRARY ADRIAN T SUMNER / SCIENCE PHOTO LIBRARY
Chromosome. Coloured scanning electron micrograph (SEM) of a condensed chromosome showing chromomeres. Chromosomes, which consist of two identical chromatids joined at a centromere, are comprised of deoxyribonucleic acid (DNA) coiled around proteins. This complex is known as chromatin. Chromomeres are granules of concentrated chromatin that show as transverse bands on the chromosome. DNA contains sections, called genes, which encode the body's genetic information, determining each cell's structure, function and behaviour. Magnification: x12,400 when printed 10 centimetres wide.
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