Post on 18-Dec-2015
Darwin & Lamarck
Evidence 1 Evidence 2Models of Evolution
DNA Speciation
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Survive and Reproduce
Charles Darwin new that organisms had traits and
behaviours that allowed them to do what?
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A single species or common ancestor
Darwin Argued that all existing species originated
from what?
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Adapting to their environments
Darwin thought that evolution was the result of
organisms doing what?
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1) All organisms have a desire to change and will act on this
2) Assumption of use and disuse
3) Acquired traits are handed down from one generation to the next
List Lamarck’s 3 assumptions about evolution
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Embryology
Homologous structures
Vestigial Structures
What are 3 indirect types of evidence of evolution?
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Appendix
Wisdom Teeth
Ear wiggling muscles
What is an example of a vestigial structure in humans?
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Embryos of different organisms are the same at early stages of development. This suggest they have come from a common
ancestor
How is embryology evidence of evolution?
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They show that changes have occurred within organisms, show that organisms have a common ancestor, shows that
enough time has passed for evolution to occur
Why are fossils direct evidence of evolution?
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Homologous structures show that organisms have a recent common ancestor
Why are homologous structures used as evidence of
evolution?
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Body parts that have a similar structure but have different functions
What are homologous Structures?
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It takes time for evolution to occur. It requires people to be born with out the
structure and mate with others born with out the structure
Why do some vestigial structures still exist?
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It means that the species is in a period where it is not changing because it is suited
to its environment
What does equilibrium mean when referring to a species?
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A species is in a state of equilibrium for an extended period of time followed by a brief and rapid period of change that produces a
new species
Explain Punctuated Equilibrium
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Mutations that occur during replication cause the variations that evolution can act
on
Why does DNA play and important role in evolution?
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It is the adaptation of structures that perform the same function due to
adaptations to similar environments
What is convergent evolution?
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It is when one species gives rise to many different species
Adaptive Radiation
What is divergent evolution?
What is another name for it?
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It is the survival of the fittest. Organisms that have traits that are best suited to an
environment survive to reproduce and those traits are then passed on
What is natural selection?
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Ancestors, separation of populations, changes in the gene pool, reproductive
isolation, sharing the same environment
What are the 5 steps of speciation?