The given statement is true that gene flow can either increase or decrease the average fitness of a population.
Gene flow is defined as the exchange of genetic material between two or more populations. If a beneficial gene is introduced into the population it will increase the fitness, and if the gene flow bring any harmful gene it will decrease the fitness of the population.
A population is defined as the group of certain individuals that live in the same place and utilize the same type of food and other resources. And most importantly, the individuals are able to interbreed among themselves.
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