Distribution in the Drosophila genome of SNPs identified in this study. The euchromatic portion of the genome is represented by horizontal bars, with the extent of each cytological division representing the genomic extent as estimated by Sorsa (1988). The positions of SNP markers identified in this study are represented by vertical hatch marks: SNPs for which sequence has been determined in all strains are represented by red hatch marks; those that were identified in pairwise subsets of strains are indicated by blue or green. The distribution is relatively even throughout the genome, with the exception of cytological divisions 78–83 near the centromere of chromosome 3. Strain designations (e.g., Q1040) and a small downward arrow indicate the positions of P elements useful for fine-scale mapping.
