Browsing by Author "Sujata Chatterjee"

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Greater Mating Success of Drosophila biarmipes Males Possessing an Apical Dark Black Wing Patch
(1987) B.N. Singh; Sujata Chatterjee
Drosophila biarmipes males possess an apical black patch on their wings. In a laboratory stock of this species, males without such a patch have been found. Mating success of these two types of male was studied in an Elcns‐Wattiaux mating chamber. Results show that males possessing the dark black patch have greater mating success than those without. This finding suggests that visual stimulus plays an important role in the mating behaviour of D. biarmipes. 1987 Blackwell Verlag GmbH
Mating ability of homo-and heterokaryotypes of drosophila ananassae from natural populations
(1986) B.N. Singh; Sujata Chatterjee
Mating ability of homo-and heterokaryotypes due to the subterminal (alpha or In (2L)A) inversion in 2L chromosome of Drosophila ananassae from three different natural populations has been studied. The data indicate that the average number of females inseminated by a given male varies for different karyotypes in males and the analysis of variance shows that the differences are highly significant for males in the three populations studied. However, the averages for different karyotypes in females show less variation as compared to males. Thus a striking sex difference exists in D. ananassae. The comparison of mating activity with gene arrangement frequencies in natural populations indicates that the gene arrangement occurring in high frequency is associated with greater mating propensity. These findings suggest that chromosomal polymorphism in D. ananassae may have a partial behavioural basis and males are more subject to intrasexual selection than females. © 1986 The Genetical Society of Great Britain.
Parallelism between male mating propensity and chromosome arrangement frequency in natural populations of drosophila ananassae
(1988) B.N. Singh; Sujata Chatterjee
Mating ability of different karyotypes due to sub-terminal (alpha or In(2L)A) inversion in 2L from two natural populations of Drosophila ananassae was investigated. The results show that the average number of females inseminated by a single male in 12-hour period varies for different karyotypes in males. The analysis of variance indicates that the differences are highly significant for males in both the populations studied. However, the averages for different karyotypes in females show no variation and thus homo-and heterokaryotypic females are equally receptive. The males heterozygous for inversion show greater mating propensity as compared with homokaryotypic males which provides evidence for heterosis associated with AL inversion in D. ananassae with respect to male mating activity. Furthermore, the comparison of male mating propensity with chromosome arrangement frequency in both the natural populations suggests that there is a correlation between mating propensity and chromosome arrangement frequency in natural populations of D. ananassae. © The Genetical Society of Great Britain.
Selection for high and low mating propensity in Drosophila ananassae
(Kluwer Academic Publishers-Plenum Publishers, 1988) B.N. Singh; Sujata Chatterjee
In Drosophila ananassae, artificial selection was carried out for high and low mating propensity for 15 generations. Response to selection was from about F5, with rapid divergence in mating frequencies in replicates of both fast and slow lines. To assess the effect of selection on the two sexes, females and males of the selected lines were tested against their respective counterparts of the control line after 15 generations. Significant differences in mating propensity were observed when selected males were tested against the control females, which suggests that males were much more affected by selection than females. After 15 generations the fast and slow lines (both replicates) were crossed inter se and mating frequencies of F1 hybrids were studied in the same way as during the selection experiment. F1 flies had a higher mating activity compared to their parental lines when males were derived from fast lines to produce hybrids. On the other hand, F1 hybrids produced by crossing slow-line males with fast-line females showed mating frequencies similar to those of the slow parental lines. These findings suggest that mating propensity in D. ananassae is under the control of polygenes. Furthermore, the significant differences in mating propensity of hybrids produced by the fast and slow males indicate the possibility of a Y-linked influence on mating propensity in D. ananassae. © 1988 Plenum Publishing Corporation.