A section of a chromosome breaks out and then reinserts itself into the gap it left,but in the opposite direction.What is this called?

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This is called an inversion, where a section of the chromosome breaks off and reinserts itself in the opposite direction. Aneuploidy refers to an abnormal number of chromosomes, translocation refers to when a section of one chromosome is swapped with a section of another, and deletion refers to when a part of a chromosome is missing.

A Section of a Chromosome Breaks Out and Then Reinserts