1974 Volume 39 Issue 2 Pages 309-314
The samples of Drosophila ananassae have been collected from Jamsoti and Lowari, two small villages of the Chakia forest, U. P., Ukhara a small town near Durgapur, West Bengal, Port Blair and Kamorta situated in Andaman and Nicobar Islands. The samples from these widely separated localities have shown that the three inversions viz., alpha (subterminal) in II L, delta (terminal) in III L and eta (basal) in III R are widely distributed. The natural populations show marked differentiation in distribution of the chromosomal types. The mean number of heterozygous inversions per individual varies in different populations. The highest value is 1.40 for the Port Blair (Andaman) population and the lowest 0.43 for the Jamsoti (Chakia forest) population.