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| The author of Origin of the Species, also the first person to observe the fact that organisms change over time due to random mutations |
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| when all the population of a species dies out. |
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| Organisms change due to random mutations and if these mutations improve their ability to live and reproduce, they will change and these changes will be pssed to their offspring. "Only the strong survive" |
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Definition
| the gene pool of all the genes in a species |
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| Changes in genes caused by natural causes or environmental causes |
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| natural selection where the average individual is favored. This results in a decline in population variation |
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| Natural selection that favors extremes in a population - a cause of major evolutionary change |
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| Natural selection that favors either extreme of a trait, the average in the middle disappears. |
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| structures with common evolutionay origins |
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| Stuctures on modern species that have no purpose anymore, but maybe once did. |
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| when allelic frequencies change due to historical events. |
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Definition
| when an organism enters or leaves the gene pool |
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| when a species is isolated away from the rest of the population and the gene pool is very limited. |
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| a type of divergent evolution in which an ancestralspecies evolves into many different species to fit a number of diverse habitat. |
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| evolution where similar species get more different because of the different environments that they live in. |
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Definition
| evolution where different species become more alike over time due to environmental pressures. |
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