Which of the following is the best example of gene flow? a) An earthquake kills most individuals in a tree population, leaving just a few survivors. b) Wind blows pollen from one population of plants to another, and cross-fertilization occurs. c) Genes are shuffled by the crossing over of chromosomes during meiosis. d) A polyploid plant develops.

Gene flow adds to genetic diversity of the population into which the gene transfer occurred. In this case the pollen carries different forms of genes and alleles from the population it came from and when it cross-fertilizes with the new population, it adds to the genetic pool of the new population.

Another example of gene flow is through migration - the individuals of from one population join another population and continue to mate randomly in the new population. The immigrants come with new alleles of genes that become amalgamated into the new population by cross-breeding.

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