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Interracial hybridization experiments between D. n. nasuta and D. n. albomicana were made. During gametogenesis there was selective elimination of abnormal gametes in F1 females; hence, only normal gametes were produced. F1 males yielded both normal and abnormal gametes. Fertility tests on F2 and backcross progeny showed males are more often sterile than females. The implications of these findings are discussed.

Inversion polymorphism, including a total of 33 inverted gene orders, was studied in South Indian populations of D. nasuta nasuta. Of these, the X chromosome has one, chromosome 2 has 10, and chromosome 3 has 22 inversions. D. nasuta nasuta has simple, tandem, included, overlapping, and complex types of paracentrics in its polymorphic system. The phylogenetic considerations of these gene orders are discussed.

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