Search results
Results from the WOW.Com Content Network
Microevolution is the change in allele frequencies that occurs over time within a population. [1] This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed macroevolution.
In eco-evolutionary dynamics, there is a cyclic interaction between evolution and ecology referred to as eco-evolutionary feedback. An organism's ecological interactions can lead to evolutionary changes of its traits. In response, the evolutionary changes alter the ecological interactions of the organism, and the cycle repeats. [4]
Evolution of photosynthesis – Origin and subsequent evolution of the process by which light energy is used to synthesize sugars; Evolution of sexual reproduction; Evolutionary arms race – Competition of sets of genes, traits, or species, that develop adaptations against each other; Evolutionary capacitance – Evolutionary biology hypothesis
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
Evolutionary biology is the subfield of biology that studies the evolutionary processes (natural selection, common descent, speciation) that produced the diversity of life on Earth. It is also defined as the study of the history of life forms on Earth. Evolution holds that all species are related and gradually change over generations. [1]
[1] [4] [5] Polymorphic populations of asexual or sexual yeast, [2] and multicellular eukaryotes like Drosophila, can adapt to new environments through allele frequency change in standing genetic variation. [3] Organisms with longer generations times, although costly, can be used in experimental evolution.
Evolutionary processes evolution microevolution : adaptation – selection – natural selection – directional selection – sexual selection – genetic drift – sexual reproduction – asexual reproduction – colony – allele frequency – neutral theory of molecular evolution – population genetics – Hardy–Weinberg principle
Ecosystem processes, such as primary production, nutrient cycling, and niche construction, regulate the flux of energy and matter through an environment. Ecosystems have biophysical feedback mechanisms that moderate processes acting on living ( biotic ) and abiotic components of the planet.