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Lecture 18

BIOL 1001 Lecture Notes - Lecture 18: Macroevolution, Genetic Drift


Department
Biology
Course Code
BIOL 1001
Professor
Tamara Kelly
Lecture
18

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BIO 1001 – MACROEVOLUTION – MARCH, 6 TH
2017
Macroevolution  patterns, origins, diversification etc. over long periods of evolutionary history
-Molecular and morphological analyses is used
Is speciation gradual or sudden?
-What fossil patterns would we expect to see if evolution was:
oGradual?
oIn bursts?
Punctuated equilibrium
Sudden evolution and long periods of stasis
What do we predict to see if speciation is gradual or sudden? Or both?
-If it’s gradual:
oSee transitional forms over a long period of time in fossil records
oEx. Transitional evolution of whales (land mammals to aquatic mammals)
-If it’s burst:
oLess than 100, 000 years
oTransitional forms may not be preserved because it is rapid
oDescendent fossil is right above ancestral fossil
Compared to gradual where there are different descendent fossil forms in
different layers where it leads up to final
What might drive rapid change?
1) Stasis phenomenon of types of living creatures showing little or no change over long
periods of time
2) Isolation between populations
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