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Definition
| Consists of all genes, including all the different alleles, that are present in a population. |
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| Number of times an allele occurs in a gene pool compared with the number of times other alleles occur. |
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Definition
| Trait controlled by a single gene that has two alleles. |
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Definition
| Traits controlled by two or more genes. |
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Definition
| Form of natural selection in which the entire curve moves: occurs when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end. |
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Definition
| Form of natural selection by which the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end. |
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Definition
| Form of natural selection in which a single curve splits into two: occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle. |
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Definition
| Random change in allele frequencies that occurs in small populations. |
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Definition
| Change in allele frequencies as a result of the migration of a small subgroup of a population. |
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Definition
| Allele frequencies in a population will remain constant unless one or more factors cause those frequencies occur. |
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Definition
| Situation in which allele frequencies remain constant. |
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Definition
| Formation of two new species. |
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Definition
| Separation of species or populations so that they cannot interbreed and produce fertile offspring. |
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Definition
| Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding. |
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Definition
| Form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water. |
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Definition
| Two or more species reproduce at different times. |
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