The loss of other circadian genes (Clock, Timeless and Cycle) did not influence learned behaviour in flies, suggesting a special role for the Per gene.
The larger differences in length between the whole fragment and the NR block were observed for timeless and cycle and this was due to the higher number of recombination events identified in these two genes (RM = 14 and 5 respectively).
Cycles, rickshaws and motorbikes all bring the traveller closer to those he hopes to meet but it was only the timeless rhythm of the saddle that would thread me into the crazed patchwork of cultures I intended to cross.
If you're still having trouble, their recommendation is a timeless one: power cycle your console.
The use of the fly as a model organism is justified by the many orthologies between Drosophila and human, in particular by the conserved circadian TTFLs, involving the clock genes period, timeless, clock and cycle (Allada and Chung, 2010).
Furthermore, circadian genes [ 7] putatively involved in the control of mating rhythms [ 8], such as timeless, Clock and cycle, are potentially important in maintaining temporal reproductive isolation between closely related species.
The timeless and the cycle loci were the only ones that shared polymorphisms between Florianópolis and Itaparica, albeit they were few (7 and 1 for the whole fragment, respectively).
Less differentiation might have been expected in the three genes that code for the highly conserved ribosomal proteins (Rp49, RpS29 and RpS2) than in loci possibly involved in the control of mating rhythms (timeless, Clock and cycle) [ 7, 8].
However, very high F ST values were detected in all loci between these two sibling species and they were even higher for Rp49, RpS29 and RpS2 (0.8865, 0.8865 and 0.8502, respectively for the whole fragment) than for timeless, Clock and cycle (0.8150, 0.7088 and 0.5806, respectively for the whole fragment).
