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Definition
| A change in a population over generations. |
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| The percent occurance for a given allele. |
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Definition
| How allelic frequencies in a population change. |
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Definition
| How accumulations of changes results in a new species or speciation. |
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Definition
| All genes in a population at one time. |
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Definition
| Characteristics that improve the chance of survival. |
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Definition
| Ability to contribute genes to the gene pool. |
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Definition
| Speciation occurs between two groups that are still living in the same area. |
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Definition
| Speciation occurs because a group has been separated from the parent group. |
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Definition
| Members of a population with the most successful adaptations to their environmental survive and reproduce. |
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Definition
| A change in the environment that favors one trait over another. |
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Definition
| Individuals of a population that can interbreed with each other. |
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Definition
| Accumulation of changes in one species that leads to another species. |
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Definition
| Budding of one or more new species from a species that continues to exist. Results in diversity. |
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Definition
| An organism that resembles in color and behavior of an organism that is distasteful. |
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Definition
| Two distasteful organisms that closely resemble one another in color and behavior. |
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Definition
| Similar, or analogous, structures, with dissimilar ancestors. |
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Definition
| Common ancestors, but diverging species. |
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Definition
| Allelic frequency changes and moved to favored traits. |
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Term
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Definition
| Increase for traits of the extreme. |
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Term
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Definition
| Intermediate phenotype is selected for and extremes are selected against. Reduces the variation in the population. |
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Term
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Definition
| Flowers are different colors, so insects can pollinate and get nectar from flower to flower. |
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Term
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Definition
| The changing of color pigment to resemble objects in the environment. Example: The stick insect. |
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Term
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Definition
| Colors are developed to warn predators that the taste is nasty. Example: The poison dart frog. |
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Term
| Orientation of Body Parts |
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Definition
| Appearances make it difficult to tell which is the front end of the organisms. Example: The lizard with a fake head. |
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Term
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Definition
| Symbiosis, where both organisms benefit. |
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Term
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Definition
| Symbiosis, where one organism benefits, and the other is unaffected. |
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Term
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Definition
| Symbiosis, where one organism benefits, and the other is harmed. |
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Term
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Definition
| Symbiosis, one species enslaves the other, controlling reproduction,and using their efforts to its own end. Example: Ants enslaving other ants. |
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Definition
| Works on larger populations over time. |
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Definition
| Fast and reduces population size. |
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Term
Darwin's 5 Observations
(Evolution was due to Natural Selection) |
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Definition
1. Within a population, there is variation.
2. Variation is inherited.
3. Within a population there is always more offspring produced than the parent population.
4. Populations remain fairly stable.
5. A certain number of offspring must die. |
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Term
| Hardy Weinberg Equilibrium |
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Definition
1. The population must be large enough where chance is not a factor.
2. Population must be isolate.
3. No mutations or mutational equilibrium.
4. Complete random mating with respect to time or space.
5. Every offspring has an equal chance of survival without regards to phenotype. |
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Term
| How might speciation occur if populations become allopatric? |
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Definition
| The finch will want to evolve to adapt because of the different selection pressure from the new environment. |
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Term
| Explain how a gene might be beneficial in one environment, but harmful in another. |
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Definition
| Sickle cell gene (AA') is favorable in Africa because symptoms exist, and immunities to Malaria occur. In the United States, Malaria is not an issue, therefore (AA) is the favorable gene, with no symptom of Sickle Cell. |
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Term
| How does variation in a given population occur? |
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Definition
| Mutations and new genes are introduces, which cause evolution. Meiosis and reproduction produce the new recombinants of phenotypes, then natural selection operates. |
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