The influence exerted by some factor (such as an antibiotic) on natural selection to promote one group of organisms over another. In the case of antibiotic resistance, antibiotics cause a selective pressure by killing susceptible bacteria, allowing antibiotic-resistant bacteria to survive and multiply.
Selection pressure can be regarded as a force that causes a particular organism to evolve in a certain direction. Organisms have many different phenotypes, or observable characteristics, many are neutral.A selective pressure is any reason for organisms with certain phenotypes to have either a survival benefit or disadvantage.Selective pressures leads natural selection.
Related Journals of Selective Pressure
Clinical Microbiology: Open Access, Cellular Microbiology, Open Microbiology Journal, Molecular Microbiology, Journal of Molecular Microbiology and Biotechnology.