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The simple answer is that which X chromosome is inactivated varies in different cell lineages, so typically a female will have cells exhibiting either wild-type or mutant phenotypes. It was Mary Lyon's observation of mosaicism in heterozygous mouse coat colour that gave the phenomenon its name. So in the case of a recessive disease there will be a phenotype, ...


It is generally known that the smaller (or less complex) an organism is, the more "condensed" it's genome is. For example, bacteria (or some eukaryotes) have operons (http://en.wikipedia.org/wiki/Operon) or overlapping genes using different and they don't have introns, which alltogether saves a lot of space. There are many reasons for that. Available space ...

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