In the 1920's Operane and Haldane hypothesized:
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that early earth had a reducing (electron adding) atmosphere that
promoted the joining of organic molecules
Sequence of events of earth's history
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1. origin of prokaryotes
2. evidence of oxidative photosynthesis
3. first eukaryotes present in the fossil record
4. land plants originate and diversify
,What must be present before natural selection can act upon a population?
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Genetic variation
Mutations
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gene pool is altered if mutations alter alleles or if entire GENES ARE
DUPLICATED OR DELETED
Hardy Weinberg
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hypothetical population that isn't evolving
1. no mutations
2. random mating
3. no natural selection
4. extremely large population
5. no gene flow
Allopatric speciation
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, occurs when gene flow between populations is interrupted due to a
population being divided into geographically isolated sub-populations
Sperm of one species may not be able to fertilize the eggs of another species.
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gametic isolation
Lamarck
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one of the earliest biologist to propose that species change through time
(evolve) but is known for proposing the wrong mechanism for how this
change occured
The role that humans play in artificial selection.
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to choose which organisms breed and which do not.
Morphological species concept
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that early earth had a reducing (electron adding) atmosphere that
promoted the joining of organic molecules
Sequence of events of earth's history
Give this one a try later!
1. origin of prokaryotes
2. evidence of oxidative photosynthesis
3. first eukaryotes present in the fossil record
4. land plants originate and diversify
,What must be present before natural selection can act upon a population?
Give this one a try later!
Genetic variation
Mutations
Give this one a try later!
gene pool is altered if mutations alter alleles or if entire GENES ARE
DUPLICATED OR DELETED
Hardy Weinberg
Give this one a try later!
hypothetical population that isn't evolving
1. no mutations
2. random mating
3. no natural selection
4. extremely large population
5. no gene flow
Allopatric speciation
Give this one a try later!
, occurs when gene flow between populations is interrupted due to a
population being divided into geographically isolated sub-populations
Sperm of one species may not be able to fertilize the eggs of another species.
Give this one a try later!
gametic isolation
Lamarck
Give this one a try later!
one of the earliest biologist to propose that species change through time
(evolve) but is known for proposing the wrong mechanism for how this
change occured
The role that humans play in artificial selection.
Give this one a try later!
to choose which organisms breed and which do not.
Morphological species concept
Give this one a try later!
