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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.
McShea (1998) discusses eight features of organisms that might indicate largest-scale trends in evolution: entropy, energy intensiveness, evolutionary versatility, developmental depth, structural depth, adaptedness, size, complexity. He calls these "live hypotheses", meaning that trends in these features are currently being considered by ...
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]
The 12 E. coli LTEE populations on June 25, 2008. [1]The E. coli long-term evolution experiment (LTEE) is an ongoing study in experimental evolution begun by Richard Lenski at the University of California, Irvine, carried on by Lenski and colleagues at Michigan State University, [2] and currently overseen by Jeffrey Barrick at the University of Texas at Austin. [3]
[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.
[5] Another possibility is that the shores of the ancient coastal waters may have been a suitable environment for the initial development of cells. Waves breaking on the shore create a delicate foam composed of bubbles. Shallow coastal waters also tend to be warmer, further concentrating the molecules through evaporation. While bubbles made ...