LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
DNA Holliday junction. Molecular model of a Holliday junction (centre) between homologous strands of DNA (deoxyribonucleic acid). A Holliday junction forms during crossing over, a natural genetic process that occurs between homologous chromosomes and leads to the switching of genetic material between the chromosomes. This recombination increases the genetic variation in a population. Atoms are represented as spheres and are colour coded: carbon (grey), hydrogen (white), oxygen (red), phosphorous (yellow) and nitrogen (blue).
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