옵션
비밀글
로 남기시려면 체크하세요
이름
필수
비밀번호
필수
이메일
제목
필수
내용
필수
<img src="https://evolutionkr.kr/wp-content/uploads/2023/01/Depositphotos_633342674_XL-890x664.jpg">The Academy's Evolution Site<br/><br/>Biological evolution is one of the most central concepts in biology. The Academies have been for a long time involved in helping people who are interested in science comprehend the theory of evolution and how it affects every area of scientific inquiry.<br/><br/>This site provides a range of sources for teachers, students and general readers of evolution. It contains the most important video clips from NOVA and the WGBH-produced science programs on DVD.<br/><br/>Tree of Life<br/><br/>The Tree of Life, an ancient symbol, represents the interconnectedness of all life. It is used in many spiritual traditions and cultures as an emblem of unity and love. It also has many practical uses, like providing a framework for understanding the evolution of species and how they react to changing environmental conditions.<br/><br/>Early attempts to describe the world of biology were founded on categorizing organisms on their metabolic and physical characteristics. These methods are based on the sampling of different parts of organisms or DNA fragments, have greatly increased the diversity of a tree of Life2. However the trees are mostly composed of eukaryotes; bacterial diversity is still largely unrepresented3,4.<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 using molecular techniques like the small-subunit ribosomal gene.<br/><br/>Despite the massive expansion of the Tree of Life through genome sequencing, a lot of biodiversity remains to be discovered. This is especially true of microorganisms, which can be difficult to cultivate and are often only found in a single specimen5. A recent analysis of all genomes resulted in a rough draft of a Tree of Life. This includes a large number of bacteria, archaea and other organisms that have not yet been identified or their diversity is not fully understood6.<br/><br/>The expanded Tree of Life can be used to evaluate the biodiversity of a particular area and determine if specific habitats require special protection. The information is useful in a variety of ways, such as finding new drugs, fighting diseases and improving the quality of crops. This information is also valuable to conservation efforts. It can aid biologists in identifying areas that are most likely to be home to cryptic species, which could perform important metabolic functions and be vulnerable to the effects of human activity. While conservation funds are important, the best method to preserve the biodiversity of the world is to equip more people in developing nations with the necessary knowledge to act locally and support conservation.<br/><br/>Phylogeny<br/><br/>A phylogeny, also known as an evolutionary tree, illustrates the connections between different groups of organisms. By using molecular information similarities and differences in morphology or ontogeny (the process of the development of an organism) scientists can construct a phylogenetic tree which illustrates the evolutionary relationship between taxonomic categories. The phylogeny of a tree plays an important role in understanding biodiversity, genetics and evolution.<br/><br/>A basic phylogenetic Tree (see Figure PageIndex 10 ) is a method of identifying the relationships between organisms with similar traits that have evolved from common ancestors. These shared traits could be either analogous or homologous. Homologous traits are identical in their evolutionary origins, while analogous traits look similar but do not have the same origins. Scientists group similar traits into a grouping known as a the clade. For instance, all the organisms that make up a clade share the characteristic of having amniotic egg and evolved from a common ancestor who had eggs. The clades are then linked to create a phylogenetic tree to determine the organisms with the closest relationship to. <br/><br/>To create a more thorough and accurate phylogenetic tree scientists use molecular data from DNA or RNA to determine the connections between organisms. This information is more precise and gives evidence of the evolutionary history of an organism. Researchers can utilize Molecular Data to determine the age of evolution of organisms and identify how many organisms share an ancestor common to all.<br/><br/>The phylogenetic relationships of a species can be affected by a number of factors that include phenotypicplasticity. This is a kind of behaviour that can change in response to specific environmental conditions. This can cause a characteristic to appear more like a species other species, which can obscure the phylogenetic signal. However, this issue can be reduced by the use of techniques such as cladistics that incorporate a combination of homologous and analogous features into the tree.<br/><br/>In addition, phylogenetics helps determine the duration and speed of speciation. This information can assist conservation biologists in deciding which species to save from extinction. In the end, <a href="http://db.yuge-info.com:8000/evolution2315">에볼루션</a> 슬롯게임 (<a href="https://www.kayserieticaretmerkezi.com/employer/evolution-korea">www.kayserieticaretmerkezi.com</a>) it is the preservation of phylogenetic diversity that will result in an ecosystem that is complete and balanced.<br/><br/>Evolutionary Theory<br/><br/>The fundamental concept in evolution is that organisms change over time due to their interactions with their environment. A variety of theories about evolution have been developed by a wide range of scientists including the Islamic naturalist Nasir al-Din al-Tusi (1201-1274) who believed that an organism would evolve slowly in accordance with its needs, the Swedish botanist Carolus Linnaeus (1707-1778) who conceived the modern hierarchical taxonomy, as well as Jean-Baptiste Lamarck (1744-1829) who suggested that the use or misuse of traits cause changes that can be passed on to the offspring.<br/><br/>In the 1930s and 1940s, theories from various fields, such as natural selection, genetics & particulate inheritance, came together to create a modern evolutionary theory. This describes how evolution is triggered by the variations in genes within a population and how these variations change with time due to natural selection. This model, which includes genetic drift, mutations, gene flow and sexual selection is mathematically described.<br/><br/>Recent discoveries in evolutionary developmental biology have revealed how variations can be introduced to a species via genetic drift, mutations and reshuffling of genes during sexual reproduction and the movement between populations. These processes, as well as others such as directionally-selected selection and erosion of genes (changes in frequency of genotypes over time) can lead to evolution. Evolution is defined by changes in the genome over time, as well as changes in phenotype (the expression of genotypes in an individual).<br/><br/>Incorporating evolutionary thinking into all aspects of biology education can improve student understanding of the concepts of phylogeny as well as evolution. A recent study by Grunspan and colleagues, for instance demonstrated that teaching about the evidence that supports evolution increased students' understanding of evolution in a college-level biology course. To find out more about how to teach about evolution, please see The Evolutionary Potential in all Areas of Biology and Thinking Evolutionarily: <a href="http://jinos.com/bbs/board.php?bo_table=free&wr_id=1081351">에볼루션바카라사이트</a> A Framework for Infusing Evolution in Life Sciences Education.<br/><br/>Evolution in Action<br/><br/>Scientists have looked at evolution through the past--analyzing fossils and comparing species. They also study living organisms. But evolution isn't just something that occurred in the past. It's an ongoing process that is that is taking place today. Bacteria mutate and resist antibiotics, viruses re-invent themselves and are able to evade new medications, and animals adapt their behavior to a changing planet. The results are usually visible.<br/><br/>It wasn't until late 1980s that biologists began realize that natural selection was in action. The key to this is that different traits result in an individual rate of survival and reproduction, and can be passed down from one generation to another.<br/><br/>In the past, if an allele - the genetic sequence that determines color - was present in a population of organisms that interbred, it could be more prevalent than any other allele. Over time, this would mean that the number of moths sporting black pigmentation could increase. The same is true for many other characteristics--including morphology and behavior--that vary among populations of organisms.<br/><br/>The ability to observe evolutionary change is easier when a species has a fast generation turnover such as bacteria. Since 1988 the biologist Richard Lenski has been tracking twelve populations of E. Coli that descended from a single strain; samples from each population are taken regularly, and <a href="https://oeclub.org/index.php/User:Evolution2881">무료 에볼루션</a> over 500.000 generations have passed.<br/><br/>Lenski's research has shown that mutations can drastically alter the rate at the rate at which a population reproduces, and consequently, the rate at which it changes. It also shows that evolution takes time, something that is difficult for some to accept.<br/><br/>Another example of microevolution is that mosquito genes that confer resistance to pesticides show up more often in areas where insecticides are used. This is due to the fact that the use of pesticides causes a selective pressure that favors people who have resistant genotypes.<br/><br/>The rapid pace at which evolution can take place has led to a growing awareness of its significance in a world that is shaped by human activities, including climate change, pollution and the loss of habitats which prevent the species from adapting. Understanding the evolution process will help us make better decisions regarding the future of our planet as well as the life of its inhabitants.
자동등록방지
자동등록방지
숫자음성듣기
새로고침
자동등록방지 숫자를 순서대로 입력하세요.
취소