February 21, 2024

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Evolution Explained

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The word “evolution” has had several meanings in history. The modern scientific definition is that species change over time. Early evolutionary thinkers such as Jean Baptiste de Lamarck and Erasmus Darwin believed that species changed in a predetermined series of stages.

Definition

There is a wide range of ways 에볼루션파워볼 in which evolution can be defined. For example, a geneticist might define evolution as a change in allele frequencies among offspring. Although such a definition is certainly part of evolution, it doesn’t include the emergence of new species and their distinctive characteristics. Hence, it would only explain microevolution but not macroevolution.

In contrast, a historian 에볼루션파워볼 might define evolution as a directional and irreversible process that gradually 에볼루션파워볼 increases the complexity of life through an accumulation of small if irregular steps. While such a definition may seem to be the most comprehensive, it would leave us unsatisfied that evolution has really been explained (see this entry for discussion of the philosophy of evolution).

The allele-frequency definition is by far the most common one used in biology today. However, it’s important to recognize that the different definitions of evolution aren’t merely semantic differences but reflect fundamentally different views about what evolutionary change is.

Origins

Biological evolution occurs through a series of natural changes in organisms that result in new species (groups of animals or plants that regularly interbreed and produce fertile offspring) appearing and then adapting to their environments. Positive mutations that give individuals a survival or reproductive advantage increase in frequency over time, while those that are disadvantageous decrease in frequency.

During his voyage on the 에볼루션파워볼 Beagle, Darwin observed many different species of plant and animal. He also collected 에볼루션파워볼 fossils. He used his observations and research to formulate a theory of evolution that he published in 1859 as On the Origin of Species.

The earliest stage of evolution was probably chemical, with self-replicating RNA molecules forming ordered interactions that eventually gave rise to DNA. Then, biological evolution began, with the divergence of three lines of descent that gave rise to present-day archaebacteria, eubacteria and eukaryotes. Studies of their genomes suggest that prokaryotes and eukaryotes shared a common ancestor about 2.7 billion years ago.

Evolution by natural selection

Natural selection is the process through which a heritable trait spreads in a population due to its beneficial effects on survival and reproduction. It is the mechanism behind evolution by adaptation and evolution by speciation. It requires variation, a system of heredity, differential survival and reproduction, and time.

Some traits are adaptive, such as a peacock’s elaborate plumage or the ability 파워볼오토 프로그램 to digest antibiotics. Other characteristics are unadapted, such as a giraffe’s long neck, which is useless for defense against predators. The giraffe’s offspring, however, inherit the longer neck, and so the trait spreads in the 에볼루션파워볼 population.

The conditions for natural selection include heritability and differential survival or reproduction, but the precise meanings of these terms are debated. For example, the phrase “differential fitness” is ambiguous: it can refer to offspring number or to a genetic variable of the type used in genotypic selection equations (see entry on units and levels of selection). Godfrey-Smith notes that some formalisms do not use the term in the latter sense, and he uses the more capacious interpretation, a view he calls “replicator selectionism.”

Evolution by artificial selection

For thousands of years, people have manipulated the evolution of plants and animals through artificial selection. When breeders select a pair of organisms to produce offspring with certain desirable hereditary traits, those alleles are spread throughout the population more frequently than others. Whether the goal is to eradicate disease, increase the yield per acre of a crop or lower competition within an ecosystem, the process of artificial selection allows humans to control evolutionary change and achieve the results they desire.

Charles Darwin used the breeding of pigeons to gather evidence for his theory of natural selection and showed that humans can Learn More Details influence evolution by selecting plants and animals with desirable traits. Modern genetic analysis shows that many genes with major effects have been selected for during the domestication of species, such as those influencing corn kernel nutrient content and the length of tassels on maize plants. It is not a big leap to realize that natural selection acts on populations over geological time scales in much the same way that artificial selection acts on species today.

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