KENT WOOD / SCIENCE PHOTO LIBRARY KENT WOOD / SCIENCE PHOTO LIBRARY
Chromosomes. Computer-enhanced light micrograph of several human chromosomes. Chromosomes carry genetic information in the form of genes. Chromosomes consist of two strands (chromatids) joined at a region known as the centromere at the centre of the X-shape. Chromosomes are capable of making exact copies of themselves while the cell is resting between successive cell divisions. When chromosomes divide, the centromere splits longitudinally to create two separate chromatids. Apart from the sex cells, every human cell contains 46 chromosomes, 23 from the father and 23 from the mother.
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