lec5_3143 - BIOL 3143 Biological Rhythms 1 Micro – Macro...

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Unformatted text preview: BIOL 3143 - Biological Rhythms 1 Micro – Macro – Reinitialize...go! Microevolution genetic changes within populations or species can be observed in short periods of time e.g. bacteria becoming resistant to antibiotics Macroevolution evolutionary patterns above the species level require lots of time e.g. fossil record BIOL 3143 - Biological Rhythms 2 Chronobiology Study of time-related phenomena in living organisms (rhythms) Ultradian extremely short cycles (lasting less than 24 hours) Tidal 12.4 hours Circadian a period of 24 hours (lasting a day). Infradian composed of long-term cycles (lasting several days). Lunar 29.4 days Circannual are cycles that recur every year (around 365 days). Circatrigintan are cycles that recur every month (around 25-35 days). Circavigintan are cycles that recur triweekly (around 17-23 days). Circadiseptan are cyles that occur biweeklly (around 12-17 days). BIOL 3143 - Biological Rhythms 3 Rhythm Cycles Time Rate of Activity (sleeping/24 hours) Amplitude Period Phase Day Night BIOL 3143 - Biological Rhythms 4 Rhythm Characteristics 1) temperature compensation 2) unaffected by biochemical pathway blockers 3) are generally synchronized with one or more environmental rhythms 4) self-sustaining 5) can be trained by environmental cues BIOL 3143 - Biological Rhythms...
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lec5_3143 - BIOL 3143 Biological Rhythms 1 Micro – Macro...

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