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Introduction to Evolution
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Biology
Evolution
Introduction to Evolution
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17 Terms
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Natural selection
________ can only increase or decrease heritable traits that vary in a population.
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Homology
________: similarity resulting from common ancestry and is the result of divergent evolution.
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Homologous structures
________: anatomical resemblances that represent variations on a structural theme present in a common ancestor.
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Traits
________ are inherited from parent to child.
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Orthologs
________ occur in separate species.
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Convergent evolution
________ does not provide information about ancestry.
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Selection
________ can act only on existing variations.
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Natural selection
________ increases the match between organisms and their environment over time.
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Convergent evolution
________: the evolution of similar, or analogous, features in distantly related groups.
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natural selection
If an environment changes over time, ________ may result in adaptation to these new conditions and may give rise to new species.
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Homology
similarity resulting from common ancestry and is the result of divergent evolution
12
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Homologous structures
anatomical resemblances that represent variations on a structural theme present in a common ancestor
13
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Convergent evolution
the evolution of similar, or analogous, features in distantly related groups
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Homologous genes
two genes derived from the same ancestral gene
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Natural selection increases the match between
organisms and their environment over time
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Why can't natural selection fashion perfect organisms?
Selection can act only on existing variations
Evolution is limited by historical constraints
Adaptations are often compromises
Chance, natural selection, and the environment interact
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Two sequences may be similar but not identical due to
the independent accumulation of different random mutations
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