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Stack #84201

Stack #84201 Evolution of Populations

TermDefinition
Gene pool Combined genetic information of all the members of a particular population
Relative frequency Number of times an allele occurs in a gene pool compared with the number of times other alleles occur.
Single-gene trait Trait controlled by a singe gene.
Polygenic trait Trait controlled by two or more genes.
Directional selection Form of natural selection where 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.
Stabilizing selection Form of natural selection where the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than indivudals at either end.
Disruptive selection Form of natural selection where 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.
Genetic drift Random change in allele frequencies that occurs in small populations.
Founder effect Change in allele frequencies as a result of the migration of a small subgroup of a population
Hardy-Weinberg principle Principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change
Genetic equilibrium Situation in which allele frequencies remain constant
Speciation Formation of new species
Reproductive isolation Separation of species or populations so that they cannot interbreed and produce fertile offspring
Behavioral isolation Form of reproductive isolation where two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
Geographic isolation Form of reproductive isolation where two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
Temporal isolation Form of reproductive isolation in which two populations reproduce at different times
Created by: Diana Key
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