ACCT 002 Lecture Notes - Lecture 18: Kea, Pleiotropy, Alcohol Tolerance
15 Sep 2020
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Document Summary
Adaptation is a feature of an organism that is present because it gives a selective advantage. examples: Crab spiders (acting camouflage) you can find them in reading have active camouflage, although it takes them three to nine days to change colour. This is topoisomerase ii, an enzyme that detangles twisted or knotted dna. Let"s consider what happens as dna unwinds during replication. As dna unwinds, it acts like this rope when we pull apart its two strands. As you pull the strands apart, twisting tension builds up in the rest of the coiled portion. It is actually adding one twist to the remaining rope for each twist pulled out of it. At some point, you can"t separate the strands any more the remaining rope is too tightly twisted. If you relax your tension on the rope it will twist around itself in a supercoil it is releasing tension.
