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number of times an allele occurs in a gene pool compared with the number of times other alleles occur
when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end
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
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
change in allele frequencies as a result of the migration of a small subgroup of a population
principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change
separation of species or populations so that they cannot interbreed and produce fertile offspring
form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
a form of reproductive isolation in which two populations are separated physically by geographical barriers such as rivers, mountains, or stretches of water
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