Erstellt von Chelsi Souch
vor etwa 8 Jahre
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WHAT IS BIOLOGICAL EVOLUTON?
Historical development of evolutionary thought
LAMARCK’S TRANSFORMATION THEORY
FATHERS OF THEORY OF
NATURAL SELECTION
Charles Lyell
The Voyage of the Beagle
Descent with Modification
REMEMBER…….
Darwin based his theory of natural selection on
two key observations...
WHAT IS ADAPTATION?
Fossils
The chronological order of which different
vertebrate groups appear in fossil records
Biogeography
Comparative anatomy
Homology vs Analogy
Comparative anatomy – Divergent evolution
Comparative anatomy – Convergent evolution
Analogous Structures
Comparative anatomy: Adaptive radiation
Comparative anatomy
______ & _______ bones evident in ancient whale fossils
Comparative Embryology
Molecular Biology
Darwin: Evolutionary trees
Darwin's theory and the modern synthesis
A population is a...
Garter snake evolution in response
to predators:
Remember spotted vs stripes
WHAT IS MICROEVOLUTION?
Genotype frequency
Allele frequency:
Microevolution is the changes in allele frequencies that
occur over time within a population, due to
Five factors which cause populations
to evolve are
Sources of genetic variation
Genetic drift is a
Gene flow
Natural selection IN TERMS OF MICROEVOLUTION*
Three general outcomes of natural selection
Sexual dimorphism
Sexual selection
The origin of species
The biological species concept defines a species as
Prezygotic barriers
The species concept is based on
Reproductive barriers between species
Postzygotic barriers
Reduced Hybrid Viability
Reproductive
barriers between
closely related
species
Mechanisms of speciation
Allopatric speciation of antelope squirrels
Sympatric speciation
Sympatric speciation: Polyploidy