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

Singh, B. N.

doi:10.1007/bf00115134

Cited by 14 publications

(6 citation statements)

References 21 publications

(29 reference statements)

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“…However, genetic identities between the South Indian populations and most of the populations of North and Central India are small. This result is very much consistent with the earlier report in D. ananassae (Singh 1986). Table 4 shows the mean of body size, a fitness trait, in different laboratory populations of D. ananassae .…”

Section: Resultssupporting

confidence: 94%

Population genetics of Drosophila ananassae: inversion polymorphism and body size in Indian geographical populations

Yadav

Singh

2003

J Zoological System

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Twelve Indian natural populations of Drosophila ananassae, a cosmopolitan and domestic species, were sampled and laboratory populations (mass cultures) were established from naturally impregnated females. These populations were maintained in the laboratory for some generations and were analysed chromosomally to know the frequency of different inversions. The chromosomal analysis revealed the presence of three cosmopolitan inversions. The data on the whole show that there are significant differences in the frequencies of different chromosome arrangements in these populations. Body size (wing length and thorax length) was measured in both sexes (50 females and 50 males), in all the 12 geographical populations of D. ananassae. There are statistically significant differences in wing length as well as in thorax length of both sexes among different geographical populations. Five geographical strains were crossed reciprocally and body size (wing length and thorax length) was measured in F 1 and F 2 progeny. The comparison of body size (both traits) between mid-parent, F 1 and F 2 shows that there is an increase in body size in F 1 and F 2 progeny as compared with parents. Thus, there is no break down of heterosis in F 2 , which suggests absence of coadaptation in geographical populations of D. ananassae. Scaling test statistical analysis showed additive, dominance and epistatic effects in certain crosses involving geographical strains of D. ananassae. Correlation between chromosome arrangement frequency and body size has also been tested and significant negative correlation has been found between 2L -ST chromosome arrangement and male thorax.

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Section: Resultssupporting

confidence: 94%

Population genetics of Drosophila ananassae: inversion polymorphism and body size in Indian geographical populations

Yadav

Singh

2003

J Zoological System

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“…With some exception in the north, results in general indicate the existence of a north-south cline in inversion frequency. The degree of genetic divergence among different populations has been quantified by cal- On the basis of data reported by Singh (1974aSingh ( , 1984aSingh ( ,b, 1989aSingh ( ,b, 1991a culating genetic distance (D) and genetic identity (I) on the basis of differences in the chromosome arrangement frequencies (Singh, 1984c(Singh, , 1986(Singh, , 1989bSingh & Anand, unpublished). In general, the populations from the south show more differentiation than those from the north.…”

Section: Population Geneticsmentioning

confidence: 99%

Population and behaviour genetics of Drosophila ananassae

Singh

1996

Genetica

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Drosophila ananassae is a cosmopolitan and domestic species. It occupies a unique status among the Drosophila species due to certain peculiarities in its genetic behaviour. The most unusual feature of this species is spontaneous male recombination in appreciable frequency. The present review summarizes the work done on population and behaviour genetics of D. ananassae from India. Population dynamics of three cosmopolitan inversions has been studied in Indian populations of D. ananassae and it is evident from the results that there is a considerable degree of genetic divergence at the level of inversion polymorphism. In general, the populations from south India show more differentiation than those from the north. These three cosmopolitan inversions, which are coextensive with the species, exhibit heterosis. Interracial hybridization does not lead to breakdown of heterosis, which suggests that evidence for coadaptation is lacking in geographic populations of D. ananassae. Heterosis appears to be simple luxuriance rather than populational heterosis (coadaptation). Unlinked inversions occur in random associations, indicating no interchromosomal interactions. However, two inversions of the third chromosome often show strong linkage disequilibrium in laboratory populations, which is due to epistatic gene interaction and suppression of crossing-over. Genetic variations for certain allozyme polymorphism and sternopleural bristle phenotypes in Indian populations of D. ananassae have also been observed. A number of investigations have also been carried out on certain aspects of behaviour genetics of Indian D. ananassae. There is evidence for sexual isolation within D. ananassae. Significant variations in mating propensity of several isofemale strains, inversion karyotypes, the diminishing effects of certain mutations on sexual activity of males and positive response to selection for high and low mating propensity provide evidence for genetic control of sexual behaviour in D. ananassae. Males contribute more to variation and thus are more subject to intra-sexual selection than females. Evidence for rare male mating advantage has also been presented. Geographic strains of D. ananassae show variation with respect to oviposition site preference. The results of studies on pupation site preference, which is an important component of larval behaviour, suggest that larval pupation behaviour in D. ananassae is under polygenic control with a substantial amount of additive genetic variation.

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“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Singh

Chatterjee

1986

Heredity

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

Cited by 14 publications

References 21 publications

Population genetics of Drosophila ananassae: inversion polymorphism and body size in Indian geographical populations

Population genetics of Drosophila ananassae: inversion polymorphism and body size in Indian geographical populations

Population and behaviour genetics of Drosophila ananassae

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

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