Question

How does directional selection drive evolutionary change?

Options

• By increasing the frequency of new alleles in a specific direction

• By preventing gene flow between two sub-populations

• By eliminating all alleles from the population's gene pool

• By maintaining phenotypic stability from generation to generation

Answer 1

Directional selection drives evolutionary change by increasing the frequency of new alleles in a specific direction, corresponding to the shift of the mean phenotype toward one phenotypic extreme under gradually changing conditions.