• meiosis
  • This path to maleness or femaleness originates at the moment of meiosis , when a cell divides to produce gametes , or sex cells having half the normal number of chromosomes. (britannica.com)
  • normally
  • The female has two X chromosomes, and all female egg cells normally carry a single X. The eggs fertilized by X-bearing sperm become females (XX), whereas those fertilized by Y-bearing sperm become males (XY). (britannica.com)
  • Cell
  • The reason for this is that, in each somatic cell of a normal female, one of the X chromosomes is randomly deactivated. (britannica.com)
  • This deactivated X chromosome can be seen as a small, dark-staining structure-the Barr body -in the cell nucleus . (britannica.com)