Definition of Heterochromatin, facultative

Reviewed on 6/3/2021

Heterochromatin, facultative: Heterochromatin that need not always be heterochromatic but which has the faculty to return to the normal euchromatic state. The inactive X chromosome is made up of facultative heterochromatin. When a woman transmits that X to a son, it reverts to euchromatin and genetic activity.


Heart Disease: Causes of a Heart Attack See Slideshow

Health Solutions From Our Sponsors