Barr body
A microscopic feature of female cells due to the presence of two X chromosomes in the female. One of these X chromosomes is inactive and is crumpled up to form the Barr body.

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Barr body 'bär- n a densely staining inactivated condensed X chromosome that is present in each somatic cell of most female mammals and is used as a test of genetic femaleness (as in a fetus or an athlete) called also sex chromatin
Barr Murray Llewellyn (1908-1995)
Canadian anatomist. A professor of microanatomy, Barr specialized in cytological research, especially as it applies to genetically determined anomalies of sex determination and development, cancer, and mental disease. His most notable work dealt with sex chromatin, now known as the Barr body. In 1949 he noted that females had in the nuclei of their nerve cells a mass of chromatin that males did not. Further study revealed that this sex difference in the nuclei of resting cells is found in most mammals.

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M. L. Barr (1908-95), Canadian anatomist

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(bahr) [Murray Llewellyn Barr, Canadian anatomist, 1908–1995] sex chromatin.

Medical dictionary. 2011.

Look at other dictionaries:

  • Barr body — [bär] n. [after M. L. Barr (1908 95), Cdn anatomist] a structure found on the inside of the nuclear membrane of female cells that takes a dark stain and indicates by its presence the sex of the individual …   English World dictionary

  • Barr body — Barr body. = sex chromatin (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Barr body — Barr body. См. половой хроматин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Barr body — Nucleus of a female amniotic fluid cell. Top: Both X chromosome territories are detected by FISH. Shown is a single optical section made with a confocal microscope. Bottom: Same nucleus stained with DAPI and recorded with a CCD camera. The Barr… …   Wikipedia

  • Barr body — Barr′ bod y [[t]bɑr[/t]] n. gen an inactiveXchromosome present in the nuclear membrane of female somatic cells, used for verifying the sex of an individual • Etymology: 1960–65; after Murray L. Barr (born 1908), Canadian physician …   From formal English to slang

  • Barr body — noun Etymology: Murray Llewellyn Barr died 1995 Canadian anatomist Date: 1961 a densely staining inactivated condensed X chromosome that is present in each somatic cell of most female mammals and is used as a test of genetic femaleness (as in a… …   New Collegiate Dictionary

  • Barr body — /bahr/ a condensed, inactivated X chromosome present in most female mammals in the nuclei of all cells except the germ cells: used, as in sports competitions, to verify that an individual is genetically female. Also called sex chromatin. [1960… …   Universalium

  • Barr body — inactivated X chromosome (for Murray L Barr) …   Eponyms, nicknames, and geographical games

  • Barr body — noun Physiology a densely staining structure in the cell nuclei of females, consisting of a condensed, inactive X chromosome and regarded as diagnostic of genetic femaleness. Origin 1960s: named after the Canadian anatomist M. L. Barr …   English new terms dictionary

  • Barr body — see sex chromatin [M. L. Barr (1908–95), Canadian anatomist] …   The new mediacal dictionary

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