15 Best Documentaries About Free Evolution

What is Free Evolution?

Free evolution is the idea that natural processes can lead to the development of organisms over time. This includes the creation of new species and 에볼루션 블랙잭 transformation of the appearance of existing species.

This has been demonstrated by numerous examples, including stickleback fish varieties that can be found in salt or fresh water, and walking stick insect types that have a preference for specific host plants. These mostly reversible trait permutations however, are not able to explain fundamental changes in body plans.

Evolution through Natural Selection

Scientists have been fascinated by the evolution of all living creatures that live on our planet for many centuries. Charles Darwin's natural selection is the most well-known explanation. This is because people who are more well-adapted have more success in reproduction and survival than those who are less well-adapted. Over time, the population of individuals who are well-adapted grows and eventually creates an entirely new species.

Natural selection is an ongoing process and involves the interaction of three factors including reproduction, variation and inheritance. Variation is caused by mutation and sexual reproduction both of which enhance the genetic diversity of a species. Inheritance is the passing of a person's genetic traits to their offspring, which includes both recessive and dominant alleles. Reproduction is the process of producing fertile, viable offspring. This can be accomplished by both asexual or sexual methods.

Natural selection only occurs when all the factors are in equilibrium. For example when a dominant allele at the gene can cause an organism to live and reproduce more often than the recessive one, the dominant allele will become more prominent within the population. However, if the gene confers an unfavorable survival advantage or reduces fertility, it will disappear from the population. This process is self-reinforcing which means that an organism with an adaptive trait will live and 에볼루션 바카라 reproduce much more than those with a maladaptive trait. The higher the level of fitness an organism has which is measured by its ability to reproduce and endure, is the higher number of offspring it can produce. Individuals with favorable traits, such as a longer neck in giraffes and bright white patterns of color 에볼루션 게이밍 in male peacocks are more likely to survive and produce offspring, so they will make up the majority of the population in the future.

Natural selection is a factor in populations and not on individuals. This is a significant distinction from the Lamarckian theory of evolution, which argues that animals acquire traits through use or neglect. If a giraffe expands its neck in order to catch prey and its neck gets longer, then its children will inherit this characteristic. The length difference between generations will continue until the giraffe's neck becomes too long to not breed with other giraffes.

Evolution by Genetic Drift

Genetic drift occurs when alleles of a gene are randomly distributed in a group. Eventually, 무료 에볼루션 only one will be fixed (become common enough that it can no more be eliminated through natural selection), and the other alleles will drop in frequency. This can result in a dominant allele at the extreme. The other alleles are eliminated, and heterozygosity decreases to zero. In a small number of people this could result in the complete elimination of the recessive allele. This is known as the bottleneck effect. It is typical of the evolutionary process that occurs whenever the number of individuals migrate to form a group.

A phenotypic bottleneck could occur when the survivors of a disaster such as an epidemic or a massive hunting event, are concentrated within a narrow area. The survivors will be largely homozygous for the dominant allele, meaning that they all have the same phenotype and therefore share the same fitness characteristics. This situation might be caused by conflict, earthquake or 에볼루션 바카라 even a disease. The genetically distinct population, if it is left susceptible to genetic drift.

Walsh, Lewens, and Ariew utilize Lewens, Walsh and Ariew employ a "purely outcome-oriented" definition of drift as any departure from the expected values of different fitness levels. They cite the famous example of twins who are both genetically identical and share the same phenotype. However one is struck by lightning and dies, whereas the other is able to reproduce.

This kind of drift could play a significant part in the evolution of an organism. However, it is not the only way to develop. Natural selection is the most common alternative, in which mutations and migrations maintain phenotypic diversity within a population.

Stephens asserts that there is a major difference between treating the phenomenon of drift as a force or a cause and considering other causes of evolution, such as selection, mutation and 에볼루션 사이트 migration as forces or causes. He claims that a causal process account of drift allows us to distinguish it from these other forces, and this distinction is vital. He further argues that drift has a direction, i.e., it tends towards eliminating heterozygosity. It also has a size, that is determined by the size of the population.

Evolution by Lamarckism

When high school students study biology, they are often introduced to the work of Jean-Baptiste Lamarck (1744 - 1829). His theory of evolution, often called "Lamarckism is based on the idea that simple organisms develop into more complex organisms by adopting traits that result from an organism's use and disuse. Lamarckism is typically illustrated with a picture of a giraffe extending its neck further to reach the higher branches in the trees. This could cause giraffes' longer necks to be passed on to their offspring who would then grow even taller.

Lamarck was a French zoologist and, in his opening lecture for his course on invertebrate zoology at the Museum of Natural History in Paris on the 17th of May in 1802, he introduced an innovative concept that completely challenged the previous understanding of organic transformation. According Lamarck, living organisms evolved from inanimate matter by a series of gradual steps. Lamarck was not the first to suggest that this might be the case, but the general consensus is that he was the one having given the subject its first general and comprehensive analysis.

The popular narrative is that Lamarckism became an opponent to Charles Darwin's theory of evolutionary natural selection, and that the two theories battled it out in the 19th century. Darwinism eventually prevailed and led to the development of what biologists today call the Modern Synthesis. The theory denies that acquired characteristics are passed down from generation to generation and instead argues that organisms evolve through the selective influence of environmental factors, including Natural Selection.

Lamarck and his contemporaries supported the idea that acquired characters could be passed on to future generations. However, this notion was never a major part of any of their theories on evolution. This is due in part to the fact that it was never tested scientifically.

It's been more than 200 year since Lamarck's birth, and in the age genomics, there is an increasing evidence-based body of evidence to support the heritability-acquired characteristics. This is also referred to as "neo Lamarckism", or more often epigenetic inheritance. This is a variant that is as valid as the popular Neodarwinian model.

Evolution through Adaptation

One of the most popular misconceptions about evolution is that it is being driven by a fight for survival. This view misrepresents natural selection and ignores the other forces that determine the rate of evolution. The fight for survival can be more accurately described as a struggle to survive in a specific environment. This could include not only other organisms, but also the physical environment itself.

Understanding how adaptation works is essential to comprehend evolution. The term "adaptation" refers to any specific characteristic that allows an organism to live and reproduce in its environment. It could be a physical structure like fur or feathers. Or it can be a trait of behavior, like moving towards shade during hot weather or moving out to avoid the cold at night.

The survival of an organism is dependent on its ability to obtain energy from the environment and to interact with other organisms and their physical environments. The organism needs to have the right genes to create offspring, and it must be able to find enough food and other resources. In addition, the organism should be capable of reproducing at a high rate within its niche.

These factors, together with mutations and gene flow can cause an alteration in the ratio of different alleles within the population's gene pool. The change in frequency of alleles can lead to the emergence of new traits and eventually new species in the course of time.

Many of the features that we admire about animals and plants are adaptations, for example, lungs or gills to extract oxygen from the air, fur or feathers to provide insulation and long legs for running away from predators, and camouflage for hiding. However, a proper understanding of adaptation requires paying attention to the distinction between physiological and behavioral traits.

Physiological adaptations, like the thick fur or gills are physical traits, while behavioral adaptations, such as the tendency to search for companions or to move to the shade during hot weather, aren't. It is important to keep in mind that insufficient planning does not cause an adaptation. In fact, failing to think about the implications of a choice can render it unadaptable even though it may appear to be sensible or even necessary.