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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.
Video: Barr Body: Definition & Formation. Learn how female cells handle two X chromosomes in their DNA by the formation of the Barr body. Discover how the X chromosome influences an organism's genetics and physical display. Barr Body: Definition & Formation.