If a population exists in an environment that changes very little, then natural selection may not provide any pressure to change. However, even under these conditions genetic driftoccurs, introducing random change within the parameters set by natural selection.
Evolution, of course. Evolution can happen without natural selection in some cases; drift, flow. Generally though, natural selection causes evolution and then, by definition, would come first.
Natural selection causes changes in the frequency of certain genetic traits within a population over time. Traits that confer a survival or reproductive advantage are more likely to be passed on to the next generation, leading to an increase in those beneficial genetic traits in the population.
Natural selection is not a thing that acts on populations, it is a tendency for harmful genes to not be passed on (die out) and useful variations to thrive and become common.
Natural selection is the process by which certain traits that provide a reproductive advantage become more common in a population over time, leading to evolutionary change. Evolution is the overall change in a population's genetic makeup over successive generations, driven by mechanisms such as natural selection. In essence, natural selection is one of the primary mechanisms through which evolution occurs.
The individual is selected and the population evolves. Keep this straight and you will avoid much confusion in the future.
Stabilizing selection occurs when the extreme forms of some trait are selected against by natural selection. It is a force of natural selection which causes evolution (definition: change of allele frequency in a population divided by time).
Natural selection usually causes a species to change gradually
Variation in traits within a population is what causes natural selection to occur. When individuals in a population exhibit different traits, those that are better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits to the next generation. This process leads to the gradual change of a population over time.
Evolution, of course. Evolution can happen without natural selection in some cases; drift, flow. Generally though, natural selection causes evolution and then, by definition, would come first.
How it can change in response to its enviroment
change through natural selection
- natural selection - sexual selection - genetic drift - immigration/emagration
change through natural selection
Natural selection causes changes in the frequency of certain genetic traits within a population over time. Traits that confer a survival or reproductive advantage are more likely to be passed on to the next generation, leading to an increase in those beneficial genetic traits in the population.
natural selection or genetic drift
Natural selection is not a thing that acts on populations, it is a tendency for harmful genes to not be passed on (die out) and useful variations to thrive and become common.
Natural selection is the process by which certain traits that provide a reproductive advantage become more common in a population over time, leading to evolutionary change. Evolution is the overall change in a population's genetic makeup over successive generations, driven by mechanisms such as natural selection. In essence, natural selection is one of the primary mechanisms through which evolution occurs.