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lyonization
The random inactivation of 1 of the 2 sets of X chromosome alleles in female diploid cells. Generally one of the 2 X chromosomes is inactivated. Selection appears to be random. Lyonization also occurs in males with Klinefelter's syndrome (XXY).
General
biochemistry
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.