Crossing-over in the X chromosome is enhanced in flies heterozygous for Dana\In(3R)ET.
Dana\In(2L)AL, Dana\In(3L)DE and Dana\In(3R)ET are cosmopolitan in distribution, genetic differentiation does exist among populations of different geographical areas and there is no evidence for intra- or interchromosomal interactions in natural populations.
Cosmopolitan inversion.