FISH micrograph of chromosomes. FISH (fluorescence in-situ hybridisation) is a technique that allows a gene (yellow) to be marked on a chromosome (red

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FISH micrograph of chromosomes. FISH (fluorescence in-situ hybridisation) is a technique that allows a gene (yellow) to be marked on a chromosome (red). Genes are regions of DNA (deoxyribonucleic acid) that encode how every cell in the body works. FISH is mainly used to confirm the position of a gene, such as one that can cause an inherited disease, on the chromosome. It was also an important technique involved in finding all the genes in the human genome project.

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Photo credit: © PATRICK LANDMANN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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