Abstract
Zaprionus indianus, a member of the family Drosophilidae, is one of the commonest and most widespread species in India. It exploits a variety of fermenting fruits in nature. The nucleolar organizer regions (NORs), mitotic and polytene chromosomes were studied. A standard map of the polytene chromosomes has been constructed in order to locate break-points precisely for naturally occurring chromosomal rearrangements. Analysis of population samples of this species from four different geographical areas has revealed the presence of a single paracentric inversion in the second chromosome. Our quantitative data on the above inversion have confirmed the excess of inversion heterozygotes in nature.
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