Chapter 17 Evolution of Populations
Terms in this set (16)
All of the alleles in all the individuals that make up a population
How often a form of a gene appears in a gene pool.
Traits controlled by two or more genes
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 of the curve
Natural selection that favors intermediate variants by acting against extreme phenotypes
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.
A change in the allele frequency of a population as a result of chance events rather than natural selection.
Genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer genetically representative of the original population.
Genetic drift that occurs when a few individuals become isolated from a larger population and form a new population whose gene pool composition is not reflective of that of the original population.
Condition in which the frequency of alleles in a population remains the same over generations.
A group of similar organisms that can breed and produce fertile offspring.
Formation of new species; an evolutionary process in which one species splits into two or more species.
Separation of a species or population so that they no longer interbreed and evolve into two separate species
Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
Form of reproductive isolation in which two or more species reproduces at different times