SNPs (Using PDA software)

Single Nucleotide Polymorphisms: shows nucleotide positions in which different strains of Drosophila melanogaster have different nucleotides. When the mouse is located over a SNP, more information is displayed including: the count and frequency of the different alleles, the ancestral allele (that which is shared with D. simulans, in case the D. simulans allele matches one of the D. melanogaster alleles), the derived allele frequency (the sum frequency of all D. melanogaster alleles other than the ancestral allele, when the ancestral allele can be inferred), the number of missing data for this position (the number of strains containing a gap or "N"), and an indication whether the polymorphism is a singleton or not (singleton means that only one D. melanogaster strain contains a nucleotide which is different from the others).