Table 1. Number of sequence differences within the mapped interval across four classes: fixed differences, polymorphic in D. americana, polymorphic in D. virilis, and shared polymorphisms found in the multiple sequence alignment of two D. americana and three D. virilis strains.

	Nucleotide substitution	Insertion/deletion	Total
Fixed difference	469	241	710
Polymorphic in D. americana	355	375	730
Polymorphic in D. virilis	130	92	222
Shared polymorphism	81	57	138
Total differences	1,035	765	1,800

Variants are classified separately as nucleotide substitutions and insertion/deletions.