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A study on the stability of circadian clocks in drosophila melanogaster populations selected for early and late emergence

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dc.contributor.advisor Sharma, Vijay Kumar
dc.contributor.author Ratna, K.
dc.date.accessioned 2019-07-18T11:04:51Z
dc.date.available 2019-07-18T11:04:51Z
dc.date.issued 2016-04-15
dc.identifier.citation Ratna, K. 2016, A study on the stability of circadian clocks in drosophila melanogaster populations selected for early and late emergence, MS thesis, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/handle/10572/2629
dc.description.abstract Circadian clocks are thought to confer adaptive advantage to organisms by appropriately scheduling behaviours in accordance with environmental conditions, and it is this feature of the clock (Ψ, phase of entrainment) that is under the purview of natural selection (Vaze and Sharma, 2013). Laboratory selection on different phases of behaviour and subsequent examination of the correlated responses of various clock properties is therefore likely to reveal genetic correlations between such clock properties and the phasing of rhythmic behaviours, and the manner in which they do so. This we think will enable us to understand the manner in which circadian clocks evolve to serve their adaptive functions. In this regard we initiated a long-term laboratory selection experiment wherein flies from four large, outbred populations of Drosophila melanogaster were selected for morning and evening emergence (Kumar et al., 2007). Along with a direct response in terms of increased emergence during morning and evening hours in the ‘early’ and ‘late’ populations respectively, correlated responses in many other clock properties were observed. The period (τ) of the ‘early’ and ‘late’ populations were shorter and longer than the ‘control’ populations respectively for both the activity-rest and eclosion rhythms, and the phase-shift responses to light pulses for eclosion rhythm among the populations were also different (Kumar et al., 2007), and later studies showed that other clock properties such as zeitgeber (cyclic environmental signal, such as light-dark cycles) sensitivity over prolonged durations, oscillator amplitude, and inter-oscillator coupling were different in these populations as a result of selection on delayed Ψ of emergence (Vaze et al., 2012a; Nikhil et al., 2016a). en_US
dc.language.iso English en_US
dc.publisher Jawaharlal Nehru Centre for Advanced Scientific Research en_US
dc.rights © 2016 JNCASR
dc.subject Circadian clocks en_US
dc.subject Drosophila melanogaster en_US
dc.title A study on the stability of circadian clocks in drosophila melanogaster populations selected for early and late emergence en_US
dc.type Thesis en_US
dc.type.qualificationlevel Master en_US
dc.type.qualificationname MS en_US
dc.publisher.department Evolutionary and Integrative Biology Unit (EIBU) en_US


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