. For the Drosophila Cy3 data at http://www.cmb.usc.edu, compute the fraction of the total signal represented by each gene (after removing controls, blanks, and flagged data). Sort the fractions in...

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For the Drosophila Cy3 data at http://www.cmb.usc.edu,

compute the fraction of the total signal represented by each gene (after removing

controls, blanks, and flagged data). Sort the fractions in order of increasing

fraction, and then plot the cumulative fraction of RNA as a function of the

fraction of genes examined. What fraction of these genes accounts for the

most abundant 20% of the transcripts? Is there evidence for classes of genes

distinguished by their expression levels?