Gene flow

Gene flow refers to the movement of genes/alleles from one population to another population altering the gene pool. Gene flow occurs as a result of reproduction between individuals from the two populations.

Mechanisms of of gene flow

Gene flow can occur due to two different types of migration:

  • The movement of alleles into a population (immigration).
  • The movement of alleles out of a population (emigration).

Note that despite plant populations unable to physically move they are still said to undergo gene glow through the dispersal of seeds, spores and pollen.

Examples of gene flow

  • The immigration of Asian populations into Australia has seen the introduction of the once rare B antigen allele for ABO blood groups.
  • The flow of alleles between different races of the crimson Rosella, that were once considered to be three distinctive species that inhabited different areas.

See also