BIO120H1 Lecture Notes - Lecture 1: Eichhornia Crassipes, Macroevolution, Mecha

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10 Oct 2016
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Three%requirments%
Variation%
Heredity%
Selection%
***did%not%understand%genetics%and%mech.%Of%inheritance%
Darwin's%theory%
The%central%unifying%concept%of%bio,%influential%concept%of%western%
thought
HOW-determine%the%physiological%or%genetic%mech.%Responsible%for%
a%trait%
§
WHY-ecological% &%adaptive%sig.%of%a%trait%
§
Questions%
Theory%of%evolution%
Micro-evolu.%Mechs.%(%process%orientated%and%experimental)%&macroevolution%=%
evolu.%History%(pattern%based%and%non-experimental)
Observe,%theoretical,%comparative,%experimental%
§
Approaches%
Organisms%on%earth%have%changed%through%time
§
The%changes%are%gradual%not%instantaneous
§
Lineages split%or branch%by%speciation resulting n%the%generation%of%
biodiversity
§
All%species%have%common%ancestors
§
Most evolutionary change results rom natural selection - the only process
responsible for the evolution of biodiversity and adaptation
§
Assumptions%
Approaches%and%assumptions%in%evolutionary%biology%
Product%of%evolu.
Process:%nat%sel.%
Biodiv-the%variety%of%life%on%earth/#&kinds%of%orgs%in%an%area
State:%noun:%trait%
§
Process:%verb:%process%leading%to%origin%of%trait%
§
Adaptation-state%or%process
Invasive%aq.%Plant%
§
Clonal%and%sexual%reproduction
§
Proff%Barrrett%Lab:%darwin%missing%form%of%water%hyacinth,%patterns%of%
genetic%div.%
Biodiversity%and%adaptation%
colonization%by%a%few%individuals%that%start%a%new%population%with%only%
limited%diversity%compared%with%the%source%population
Founder%events%
Water%hyacinth%cloning%=%most%reproduction
Clonal%propagation
Hover%or%perch%during%nectar%feeding%
Bird%pollination%
Is%an%adaptation%
In%Rat%Tail%plant%
Feeding%strategy%
Efficient%cross-pollination%and%high%seed%set%
Remove%=%reduce%fertility%and%outcrossing%
Perch%function%
Reproductive%success-example%is%the%bird%perch%of%rat%tail%
-fitness= performance of transferring genes
-hard to look at an organism and try to understand it without knowing its evolutionary
history
Topics%and%Concepts
Lecture'1'Intro'to'evolutionary'biology'
Friday,%October%7,%2016
10:22%PM
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