Incipient sexual isolation in thenasuta-albomicans complex ofDrosophila: No-choice experiments |
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Authors: | M T Tanuja N B Ramachandra H A Ranganath |
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Institution: | (1) Drosophila Stock Centre, Department of Studies in Zoology, University of Mysore, 570 006 Manasagangotri, Mysore, India |
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Abstract: | Drosophila nasuta nasuta andDrosophila nasuta albomicans are cross-fertile races ofDrosophila. Hybridization between these races in the laboratory has given rise to new races (Cytoraces), among which karyotypic composition
differs from one another and also from those of the parental races. In this study, we search for the evidence of incipient
reproductive isolation among the parental races and four Cytoraces by assessing the fraction of no-matings, mating latency
and copulation duration in all possible types of homo- and heterogamic crosses (N = 4184). In no-choice conditions, the latency
time (time to initiation of copulation) is lower in homogamic crosses than in heterogamic crosses for both parental races
and Cytoraces. Latency time and copulation duration are negatively correlated, whereas fraction of no matings is positively
correlated with latency time. Thus these six closely related races of thenasuta-albomicans complex show the initiation of the earliest stages of pre-zygotic isolation, manifested as a tendency for matings to be initiated
earlier and more often, and for a longer duration, among homogamic rather than heterogamic individuals. |
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Keywords: | Chromosomal races copulation duration Drosophila mating latency no-choice experiment reproductive isolation |
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