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The Academy's Evolution Site<br><br>Biological evolution is a central concept in biology. The Academies have long been involved in helping those interested in science understand the theory of evolution and how it permeates all areas of scientific research.<br><br>This site provides students, teachers and general readers with a variety of educational resources on evolution. It includes key video clip from NOVA and WGBH produced science programs on DVD.<br><br>Tree of Life<br><br>The Tree of Life is an ancient symbol that represents the interconnectedness of all life. It appears in many cultures and spiritual beliefs as an emblem of unity and love. It can be used in many practical ways as well, such as providing a framework to understand the history of species and how they respond to changing environmental conditions.<br><br>Early attempts to represent the world of biology were built on categorizing organisms based on their metabolic and physical characteristics. These methods are based on the sampling of different parts of organisms, or fragments of DNA, have significantly increased the diversity of a tree of Life2. However these trees are mainly made up of eukaryotes. Bacterial diversity remains vastly underrepresented3,4.<br><br>Genetic techniques have greatly broadened our ability to visualize the Tree of Life by circumventing the requirement for direct observation and experimentation. We can create trees by using molecular methods such as the small subunit ribosomal gene.<br><br>The Tree of Life has been significantly expanded by genome sequencing. However there is still a lot of diversity to be discovered. This is especially true for microorganisms that are difficult to cultivate, and which are usually only present in a single sample5. A recent analysis of all genomes produced an unfinished draft of the Tree of Life. This includes a variety of archaea, bacteria and other organisms that haven't yet been isolated or whose diversity has not been fully understood6.<br><br>The expanded Tree of Life can be used to assess the biodiversity of a specific area and determine if particular habitats require special protection. The information can be used in a range of ways, from identifying the most effective medicines to combating disease to enhancing the quality of the quality of crops. The information is also useful to conservation efforts. It can aid biologists in identifying the areas that are most likely to contain cryptic species with important metabolic functions that could be at risk from anthropogenic change. While funds to protect biodiversity are essential however, the most effective method to ensure the preservation of biodiversity around the world is for more people living in developing countries to be empowered with the knowledge to take action locally to encourage conservation from within.<br><br>Phylogeny<br><br>A phylogeny (also known as an evolutionary tree) shows the relationships between organisms. Using molecular data, morphological similarities and differences or ontogeny (the process of the development of an organism) scientists can create an phylogenetic tree that demonstrates the evolutionary relationship between taxonomic groups. The concept of phylogeny is fundamental to understanding evolution, biodiversity and genetics.<br><br>A basic phylogenetic tree (see Figure PageIndex 10 Finds the connections between organisms that have similar traits and have evolved from an ancestor with common traits. These shared traits can be homologous, or analogous. Homologous traits are similar in their evolutionary journey. Analogous traits may look like they are, but they do not share the same origins. Scientists combine similar traits into a grouping known as a the clade. For example, all of the organisms that make up a clade share the trait of having amniotic egg and evolved from a common ancestor that had eggs. The clades then join to create a phylogenetic tree to identify organisms that have the closest relationship. <br><br>Scientists utilize DNA or RNA molecular information to build a phylogenetic chart that is more accurate and detailed. This information is more precise and provides evidence of the evolutionary history of an organism. Researchers can utilize Molecular Data to estimate the age of evolution of organisms and  에볼루션바카라; [http://q.044300.net/home.php?mod=space&uid=981817 q.044300.net], determine how many organisms have the same ancestor.<br><br>The phylogenetic relationships of organisms can be influenced by several factors, including phenotypic plasticity a kind of behavior that changes in response to specific environmental conditions. This can cause a characteristic to appear more similar to one species than other species, which can obscure the phylogenetic signal. This issue can be cured by using cladistics, which is a the combination of homologous and analogous traits in the tree.<br><br>In addition, phylogenetics can aid in predicting the duration and rate of speciation. This information can assist conservation biologists make decisions about which species to protect from extinction. It is ultimately the preservation of phylogenetic diversity which will lead to a complete and balanced ecosystem.<br><br>Evolutionary Theory<br><br>The central theme of evolution is that organisms acquire different features over time based on their interactions with their environment. A variety of theories about evolution have been developed by a wide range of scientists such as the Islamic naturalist Nasir al-Din al-Tusi (1201-1274) who believed that an organism would evolve slowly according to its requirements and needs, the Swedish botanist Carolus Linnaeus (1707-1778) who developed the modern hierarchical taxonomy Jean-Baptiste Lamarck (1744-1829) who suggested that the use or  [https://menwiki.men/wiki/How_To_Create_An_Awesome_Instagram_Video_About_Evolution_Baccarat 에볼루션 카지노] 바카라 무료 ([https://www.footballzaa.com/out.php?url=https://ai-db.science/wiki/A_Comprehensive_Guide_To_Evolution_Casino_Site_Ultimate_Guide_To_Evolution_Casino_Site Www.footballzaa.Com]) misuse of traits cause changes that can be passed on to the offspring.<br><br>In the 1930s and 1940s, ideas from a variety of fields -- including genetics, natural selection, and particulate inheritance -- came together to form the modern evolutionary theory synthesis which explains how evolution is triggered by the variation of genes within a population and how those variations change over time due to natural selection. This model, which incorporates genetic drift, mutations in gene flow, and sexual selection is mathematically described.<br><br>Recent discoveries in the field of evolutionary developmental biology have shown that genetic variation can be introduced into a species via mutation, genetic drift, and reshuffling genes during sexual reproduction, as well as through the movement of populations. These processes, along with others such as the directional selection process and the erosion of genes (changes in the frequency of genotypes over time), can lead towards evolution. Evolution is defined as changes in the genome over time, as well as changes in phenotype (the expression of genotypes within individuals).<br><br>Incorporating evolutionary thinking into all areas of biology education could increase student understanding of the concepts of phylogeny and evolution. A recent study by Grunspan and colleagues, for instance demonstrated that teaching about the evidence that supports evolution increased students' acceptance of evolution in a college-level biology course. For more details about how to teach evolution read The Evolutionary Potential in all Areas of Biology or Thinking Evolutionarily as a Framework for Infusing Evolution into Life Sciences Education.<br><br>Evolution in Action<br><br>Scientists have traditionally looked at evolution through the past, studying fossils, and comparing species. They also study living organisms. Evolution isn't a flims event; it is a process that continues today. Bacteria mutate and resist antibiotics, viruses evolve and  [https://www.metooo.es/u/676b657d52a62011e858a393 에볼루션 코리아] escape new drugs, and animals adapt their behavior to a changing planet. The changes that occur are often visible.<br><br>However, it wasn't until late 1980s that biologists realized that natural selection could be seen in action, as well. The main reason is that different traits result in an individual rate of survival as well as reproduction, and may be passed down from one generation to the next.<br><br>In the past, if an allele - the genetic sequence that determines colour - was present in a population of organisms that interbred, it could be more prevalent than any other allele. In time, this could mean the number of black moths within a population could increase. The same is true for many other characteristics--including morphology and behavior--that vary among populations of organisms.<br><br>It is easier to observe evolution when a species, such as bacteria, has a high generation turnover. Since 1988, Richard Lenski, a biologist, has studied twelve populations of E.coli that descend from a single strain. Samples of each population have been collected regularly and more than 50,000 generations of E.coli have passed.<br><br>Lenski's work has shown that mutations can alter the rate of change and the rate of a population's reproduction. It also shows evolution takes time, something that is difficult for some to accept.<br><br>Microevolution can be observed in the fact that mosquito genes that confer resistance to pesticides are more prevalent in populations where insecticides are used. This is due to the fact that the use of pesticides causes a selective pressure that favors individuals with resistant genotypes.<br><br>The rapid pace at which evolution can take place has led to an increasing recognition of its importance in a world shaped by human activity--including climate change, pollution, and the loss of habitats which prevent many species from adjusting. Understanding the evolution process can help you make better decisions about the future of our planet and its inhabitants.