Sex-Linked Traits — Definition & Examples

Only the maternal X chromosome is ever turned into a Barr body.

Only the paternal X chromosome is ever turned into a Barr body.

In XY individuals, the X chromosome is also turned into a Barr body.

Since either X chromosome can be inactivated, all cells have a 50/50 chance of expressing either X-linked gene.

Since either X chromosome can be inactivated, all cells have a 75/25 chance of expressing the paternal X over the maternal X.