Term
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Definition
| proposes that all organisms are made of cells and that all cells come from pre-existing cells |
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Term
| theory of evolution by natural selection |
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Definition
| maintains that the characteristics of species change through time — primarily because individuals with certain heritable traits produce more offspring than do individuals without those traits |
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Term
| Two conditions that must be met for natural selection to occur in a population |
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Definition
(1) individuals in the population vary in characteristics that are heritable
(2) in a particular environment, certain versions of these heritable traits help individuals survive better or reproduce more than do other versions |
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Term
| Natural selection acts on ________, but evolutionary change affects only ___________ |
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Definition
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Term
| A genus is made up of ________ |
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Definition
| a closely related group of species |
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Term
| A species is made up of ______ |
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Definition
| individuals that regularly breed together or have characteristics that are distinct from those of other species |
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Term
| rRNA sequences should be very similar in _______ but less similar in organisms that ______. Thus, small subunit rRNA sequences can be used to produce a phylogenetic tree that shows relationships among species. |
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Definition
| closely related organisms; are less closely related |
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