A population is the smallest unit of life that can evolve. This is because evolution is a process that takes place over extended periods of time through adaptations that are passed through the reproduction of individuals who contribute to the population.Know More
Scientists do not believe that individuals evolve in their single lifetime, making it so that an individual or any of the parts that comprise it, such as a tissues or cells, are not capable of evolution. Individuals contribute to evolution through their transmission of DNA that may carry adaptations to their offspring.
As the majority of individuals in a population change in a synchronized way, evolution begins to occur. Populations then contribute to the evolution of their larger communities, followed by ecosystems and finally, the biosphere.Learn more about Biology
Microevolution is change over time that occurs within a population of a species, whereas macroevolution involves changes outside of a single species, such as a classification of species. Macroevolution involves finding general patterns to changes within multiple species.Full Answer >
Founder effects are genetic phenomena, such as limited variation, among a population that started when a small group of people previously settled into a new area. The effect has been commonly observed in isolated areas where colonies were settled.Full Answer >
Natural selection results in adaptations when certain individuals in a population have higher reproduction and survival rates due to the presence of a particular trait. As this advantageous trait is passed on over the course of many generations, all individuals eventually possess the trait and the population evolves.Full Answer >
Density dependent factors are factors that affect a population's growth differently depending on the density of that population. A prime example of a density dependent factor is sickness, which limits a population's growth more severely when density is high, as illness spreads more easily when organisms are in close contact.Full Answer >