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Intra- and interspecies variations in pupation height in Drosophila.

In order to study the pupation site preference which is an important component of larval behaviour, pupation height was scored in Drosophila ananassae, D. bipectinata and D. malerkotliana by using a large number of strains of these species. The mean pupation height of different strains ranged from 1.1 to 8.7 mm in D. ananassae, from 0.41 to 0.75 mm in D. bipectinata and from 1.0 to 1.3 mm in D. malerkotliana. The analysis of variance and t-test were performed to test intre- and interspecies variations in pupation height. These tests revealed significant variation among three species. Significant variations among different strains of the same species were also found in D. ananassae and D. bipectinata. These observations provide evidence for intra- and interspecies variations in pupation height in Drosophila. Variations among different strains of the same species in pupation height are attributable to genetic heterogeneity among the strains.