| evidence for introgression in differentiated north-american and finnish drosophila montana populations. | the virilis group species drosophila montana is widely distributed around the northern hemisphere. here we show that it consists of at least two well differentiated populations (finnish and north-american populations) that have been diverging for the last 0.55-0.95 my. these populations show significant chromosomal, behavioural and morphological differences, but no apparent postzygotic isolation. evidence for introgression is found for both finnish and north-american populations at two out of th ... | 2005 | 15954499 |