Figure 1: Cumulative distribution of genic and genomic G+C-content domains in Apis mellifera, Anopheles gambiae, Drosophila melanogaster and Tribolium castaneum.
From: The genome of the model beetle and pest Tribolium castaneum
Cumulative distributions show the fraction of genes (thick lines) or of the entire genome (thin lines) occurring in G+C-content domains less than a given percentage G+C (<X). The more (A+T)-rich half of the T. castaneum genome contains only 30.8% of all T. castaneum genes (31.4% and 33% of A. gambiae and D. melanogaster genes, respectively), whereas the more (A+T)-rich half of the A. mellifera genome contains 77.6% of its genes. At every point on the T. castaneum, A. gambiae and D. melanogaster curves there are fewer genes present in the fraction of the genome less than a given percentage G+C than would be expected if the genes were randomly distributed. In contrast, A. mellifera exhibits the opposite distribution.
