Evolutionary genetics of two sibling species, Drosophila simulans and D. sechellia.

Abstract

Drosophila simulans and D. sechellia are sibling species, the former cosmopolitan and the latter restricted to the Seychelles Islands. Classical genetic analysis was used to measure the numbers and effects of genes responsible for reproductive isolation and morphological differences on male genitalia between these species. Many of the nucleotide differences among these species actually represent polymorphisms within common ancestors.-from Author