Set of human chromosomes SEM Science Image

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Set of human chromosomes, coloured scanning electron micrograph (SEM). Chromosomes are a packaged form of the genetic material DNA (deoxyribonucleic acid). The DNA condenses into chromosomes during cell replication for ease of division and transport into the new cell. A complete set of chromosomes is known as a karyotype. In humans, there are 46 chromosomes, consisting of 23 chromosome pairs. Magnification: x1850 when printed at 10 centimetres wide.