Lack of global meiotic sex chromosome inactivation, and paucity of tissue-specific gene expression on the Drosophila X chromosome.

Strikingly, highly-biased genes constitute less than one-quarter of the X -linked genes, and this difference from the autosomal genes is highly significant (χ 2 test, P = 3 × 10 -10 ) (Figure 3 , orange bars).

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