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| Comparing layers of sedimentary rocks. |
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| A belief that living things could arise from nonliving things. |
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| Using radioactive decay to determine how old a object might be. |
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| One bacterium engulfed another, which survived inside the other. Both benefit from the arrangement. |
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| Genetic variations in a species might result from: |
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Definition
| gene shuffling and mutations |
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| The ability of an individual organism to survive and reproduce in it specific environment. |
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| Descent with modification |
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Definition
Species have descended with changes from other species over time.
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| All living things are derived from a common ancestor. |
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Structures that have different forms but have the same embryonic tissue.
Same structure, different function. |
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| Same function, different structure. Example: moth and bird. |
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| Organs that are reduced in size which are traces of homologous organs found in other organisms. |
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| Embryo similarities in the beginning stages of life. |
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| Change in the collective genetic material of a population. |
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| The number of times an allele occurs in a gene pool compared with the number of times other alleles occur. |
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| Where a person would breed plants or organisms for certain desirable traits. |
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| Any inherited characteristic that increases an organism chance of survival. |
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| The evolutionary history of a species or taxonomic group. |
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| All of the genes of the reproductively active members of a population. |
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Definition
| Individuals with the average from of a trait have the highest fitness. |
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| Individuals with either extreme variation of a trait have greater fitness than individuals with the average from of the trait. |
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| Individuals that display a more extreme form of a trait have greater fitness than individuals with average from of a trait. |
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Definition
Random change in the allele frequency often producing offspring that will be different from the original population by chance.
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| Change in allele frequencies as result of the migration of a small subgroup of population. |
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| The frequency of alleles in a population does not change over generations unless outside forces act on the population. |
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| Formation of a new species. |
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| The use of internal and external structure and appearance of an organism to classify a species. |
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| Where populations becomes isolated from each other. Example Hawaii Fruit flies |
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| Occus when two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding. |
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Term
Allopatric speciation
(Geographic isolation) |
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Definition
| Populations are separated physically geographic barriers such as rivers, mountains or stretches of water. |
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| Populations reproduce at two different times. |
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| Occurs when two subpopulations becomes reproductively isolated within the same geographic area. |
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| Rate of speciation that occus at a regular, gradual rate. |
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| Rate of speciation that causes sudden rapid change. |
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