Stuck on a problem? Get great tutoring at an affordable price with Chegg. Click here to join and get your 1st 30 minutes Free!

Barr body

From Biology-Online Dictionary
Jump to: navigation, search



The small, dark-staining mass of inactive X chromosome within the nucleus of non-dividing cell.


Barr bodies are previously used as the basis for sex determination especially during the Olympics (see Barr test).

Word origin: named after its discoverer Murray Llewellyn Barr, a Canadian anatomist who first identified the particle in the nucleus of neurons of female cats.

Synonym: sex chromatin

See also: Barr test