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16 Cards in this Set
- Front
- Back
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Evolution
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Changes in a population or species over time, descent with modification
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Species
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a group of similar organisms that can mate with each other and produce fertile offspring.
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Fossil
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the preserved remains or traces of an organism that lived in the past.
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Adaptation
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a trait that helps an organism survive and reproduce.
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Theory
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A hunch or a guess.
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Scientific theory
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Drawing observations together to make one inference.
Observations/ Data------> Inferences-------> Theory |
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Natural selection
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The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.
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Variation
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Any difference between individuals of the same species.
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Fitness
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The ability to survive and reproduce.
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Mutation-
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○ Substitution- Exchange one base pair for another.
○ Deletions- remove DNA. ○ Insertions (addition)- add DNA. |
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Speciation
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The divergence, or branching, or one species into two distinct species.
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Adaptive radiation
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When one species branches into many different species.
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Homologous structures
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Similar structures that related species have inherited from a common ancestor.
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Branching tree
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A diagram that shows how scientists think different groups of organisms are related.
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Trace fossil
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The evidence (track, trail, footprint) left behind from an organism.
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Paleontologist
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a scientist that studies fossils.
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