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Bio 201 S14 Class 5 2 5 14 v2

If they cause bad eects deleterious individuals

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Unformatted text preview: varia1on” in a popula1on consists of the accumulated muta1ons over 1me, most of which have been present in the popula1on for several or many genera1ons –  Thought ques1on: Why is there any standing varia1on? Why isn’t it all eliminated by natural selec1on? SLIDE 3 what happens to new muta1ons? •  if they cause bad effects (deleterious), individuals carrying them usually die or have low survival and/or reproduc1on –  DELETERIOUS MUTATIONS ARE USUALLY QUICKLY ELIMINATED FROM THE POPULATION •  if they have no effect (neutral) or have beneficial effects, they may survive but are s1ll USUALLY LOST BY GENETIC DRIFT SLIDE 4 Evolu1on in your everyday life •  An ar1st’s image of the H1N1 influenza virus that was the target of a recent flu vaccine. The spikes represent viral surface proteins, whose rapid evolu1on allows flu viruses to escape the host’s immune system. •  (Ch. 21 opening image) SLIDE 5 the bafle against flu is a bafle against the effects of evolu1on •  influenza viruses have an RNA genome encoding 11 proteins –  genome length 13000- 15000 base pairs •  high muta1on rate •...
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