Chromosome, SEM

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Chromosome, SEM

Chromosome. Coloured scanning electron micrograph (SEM) of a chromosome with a chromatid break (left). Chromosomes consist of two identical chromatids joined at a centromere. Each chromatid is comprised of deoxyribonucleic acid (DNA) coiled around proteins. A break in a chromatid can happen spontaneously or because of environmental factors such as radiation or physical stress. The chromatid may be rejoined by enzymes, with no further consequences. However, the fragment not attached to the centromere can be lost, deleting part of the chromosome. Depending upon the length and genes lost this may be lethal, especially in the sex cells, which have only 1 copy of each chromosome. Magnification: x8, 800 at 10cm wide

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Media ID 6423108

© ADRIAN T SUMNER/SCIENCE PHOTO LIBRARY

Broken Centromere Chromatid Chromatids Chromatin Chromosome Coiled Condensed False Colour Fragment Gene Genes Genetic Material Genome Genomics Heredity In Formation Inherited Lethal Mutation Deletion Deoxyribonucleic Acid False Coloured Genetics

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