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A 1.6-kb fragment encompassing the rp49 gene, which codes for a ribosomal protein, has been cloned and sequenced in Drosophila subobscura. The rp49 coding region has accumulated 46 nucleotide differences out of 402 bp since D. subobscura diverged from D. melanogaster. Forty-three percent of the effectively silent sites have changed since both species diverged. Both silent and replacement differences are distributed at random between the two exons of the gene. The frequency of silent differences in exons does not differ from that observed in the 5' leader sequence and in the intron. The frequency of silent differences in exon and intron sites is much greater than the number of amino acid replacement differences. This observation indicates strong purifying selection against amino acid replacements.

Nucleotide sequence comparison of the rp49 gene region between Drosophila subobscura and D. melanogaster.