Selection pressure and where it comes from:
Selection pressure: factors that are involved in selecting which variations will increase the chance of survival of an individual over others. It is a force of nature that determines how an organism evolves.
This force is not physical, but involves the natural variations of a species and how factors of the environment allow a certain variation of the species to survival longer.
This pressure pushes the evolution of an organism so that more of its population possess the advantageous variation.
Though selection pressure does not occur for the good of a species, it is only good for the individuals that possess the particular variation that allows them to survival longer in that environment.
Selection pressures can come from anything as long as it acts at a consistent level over a long period of time.
It must also have an impact on the reproduction and rate of survival of a species.
Selection pressures may include presence of predators, availability of prey, stresses on the environment or competition between species (including humans).
Selection pressure: factors that are involved in selecting which variations will increase the chance of survival of an individual over others. It is a force of nature that determines how an organism evolves.
This force is not physical, but involves the natural variations of a species and how factors of the environment allow a certain variation of the species to survival longer.
This pressure pushes the evolution of an organism so that more of its population possess the advantageous variation.
Though selection pressure does not occur for the good of a species, it is only good for the individuals that possess the particular variation that allows them to survival longer in that environment.
Selection pressures can come from anything as long as it acts at a consistent level over a long period of time.
It must also have an impact on the reproduction and rate of survival of a species.
Selection pressures may include presence of predators, availability of prey, stresses on the environment or competition between species (including humans).