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| form of natural selection in which the entire curve moves; occurs when individuals at one end of a distribution curve have higher fitness than those in the middle or at the other end | ||
| form of natural selection when individuals near the center of the curve have higher fitness than those at either end of the curve | ||
| form of natural selection in which a single curve splits into 2, occurs when individuals at both ends of a distribution curve have higher fitness than those in the middle | ||
| a random change in the frequency of alleles in a small population. | ||
| change in allele frequencies as a result of the migration of a small sub group of a population. | ||
| principle that allele frequencies in a population will remain constant unless one or more factors cause it to change. | ||
| situation in which allelic frequencies remain constant | ||
| formation of new species | ||
| separation of species or populations so that they cannot interbreed and produce fertile offspring. | ||
| form of reproductive isolation in which 2 populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding. | ||
| form of reproductive isolation in which 2 populations are separated physically by geographic barriers such as rivers and mountains | ||
| form of reproductive isolation in which 2 populations reproduce at different times | ||
| the combined genetic information of all members of a population | ||
| number of times an allele occurs in a gene pool compared with the number of times other alleles occur | ||
| trait controlled by a single gene that has two alleles | ||
| trait contolled by two or more genes |
