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Evolution - Coggle Diagram
Evolution
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Evidence of evolution
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- Molecular Traits/Biochemistry
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Structures
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• Vestigial structure- structure is still present, yet is not functional
Mutations
Germ-line mutations occur in gametes and can be passed down To offspring. THESE ARE THE MOST IMPORTANT IN EVOLUTION!
Somatic-cell mutations occur in all other cells found throughout the organism and CAN NOT be passed down to offspring.
The genetic Drift
Bottleneck effect- occurs when a population’s size declines dramatically because of some dramatic event (earthquake, epidemic, etc). It is a random event where some genes disappear from the population and the survivors have a smaller gene pool.
Founder effect- when a small number of individuals establishes a new population and a loss of genetic variation ensues. This can lead to a new species.
Barriers
Pre-zygotic Barriers
Barriers that prevent mating from occurring in the first place Temporal, ecological (physical barriers), behavioral, Mechanical (incompatible sexual structures)
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