High frequency of cosmopolitan inversions in natural populations of Drosophila ananassae from Kerala, South India

Abstract

BCi hybrid induced by the pollen of P. americanum, and the successful induction of parthenogenetic embryo development by the pollen of P. setaceum suggested that pseudogamy is a complex phenomenon involving a genetic interaction between the two gametophytes.One of the four progeny from the SC165-2 X P. setaceum cross was morphologically different

Mating ability of homo- and heterokaryotypes of Drosophila ananassae from natural populations

“…Drosophila ananassae, a cosmopolitan domestic species, has a high degree of chromosomal variability (for references, see Singh, 1982). The Indian natural populations of this species are genetically differentiated at the level of chromosomal polymorphism (Singh, 1974(Singh, , 1984a(Singh, , 1984b(Singh, , 1984c(Singh, , 1985a(Singh, , 1985b. The subterminal (alpha or In (2L)A) inversion has become universally established in the species (Shirai and Moriwaki, 1952;Futch, 1966;Singh, 1970).…”

Genetic similarity between natural populations of Drosophila ananassae from Kerala and Andaman and Nicobar Islands

“…By using the data on the gene arrangement frequencies in eight natural populations (Singh, 1974(Singh, , 1984a, genetic identity and distance between populations were estimated (Singh, 1984b) and the data revealed that the populations from the Andaman and Nicobar Islands have undergone a considerable degree of genetic divergence when compared with the North Indian populations. Now the data on the frequencies of different gene sequences are available for four natural populations of D. ananassae from Kerala, South India (Singh, 1984c). During the present study, the Kerala populations were compared with each other and also with the populations from other parts of India including the Andaman and Nicobar Islands for a general measure of heterogeneity by calculating the genetic identity between populations.…”

“…In some of the populations the chromosomes with standard gene order occur in high frequency while in others the chromosomes with inverted gene sequence are more frequent. Singh (1984c) analysed four natural populations of D. ananassae from Kerala state in South India for chromosome inversions. The populations analysed are Trichur, Ernakulam, Quilon and Trivandrum.…”

Drosophila ananassae Stands Distinct from other Species of Drosophila in its Pattern of Chromosomal Polymorphism

“…Interestingly, evidence for the absence of coadaptation in D. ananassae has also been provided by Yadav and Singh (2003), Singh (1982b) and Singh and Singh (2010a). 5) Extensive data on the frequencies of three cosmopolitan inversions in Indian natural populations of D. ananassae have been presented by Singh and his coworkers (Singh, 1984(Singh, , 1989(Singh, , 1996(Singh, , 1998Singh & Singh, 2007a). Their results demonstrated that Indian populations show evolutionary divergence and populations from south show more divergence when compared with those from the north.…”