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A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome.
Females shut off one of their X chromosomes during embryonic development. The inactivated X chromosome is called a Barr body and is sometimes referred to as sex chromatin. If females genetically expressed both of their X chromosomes at once, then double the necessary genetic product would be produced.