Barr bodies: Difference between revisions
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To work out the number of Barr bodies for an individual the formula: Xn-1 can be used. |
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< | A barr body<ref>''Barr body'' http://en.wikipedia.org/wiki/Barr_body September 3, 2014.</ref> is an inactive <a href="X chromosome">X chromosome</a> in female cells or the inactive Z in a male. Lyonization is the process where the chromosome is inactivated in species. | ||
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In men and women with more than one X chromosome, the number of Barr bodies visible at interphase is always one less than the total number of X chromosomes. | |||
For example, a man with Klinefelters syndrome, with 47 chromosomes, XXY karyotype have two Barr bodies, whereas an female with Turners syndrome, with 45 chromosomes, XO karyotype does not have any Barr bodies. | |||
=== References === | |||
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Revision as of 19:45, 25 November 2014
A barr body[1] is an inactive <a href="X chromosome">X chromosome</a> in female cells or the inactive Z in a male. Lyonization is the process where the chromosome is inactivated in species.
In men and women with more than one X chromosome, the number of Barr bodies visible at interphase is always one less than the total number of X chromosomes.
For example, a man with Klinefelters syndrome, with 47 chromosomes, XXY karyotype have two Barr bodies, whereas an female with Turners syndrome, with 45 chromosomes, XO karyotype does not have any Barr bodies.
References
- ↑ Barr body http://en.wikipedia.org/wiki/Barr_body September 3, 2014.