Theories Of Natural Selection

The book of Genesis states that God created life in an array of fixed species and it was not until the 19th Century, that paleontological discoveries started to cast doubt on creationism and Charles Darwin published his theory of evolution in On the Origin of the Species (Clegg, 2007, p.120). The two processes that are involved in evolution and the fundamental connections between the evolutionary process and behaviour, in particular that of altruism and whether it can be seen as an adaptive behaviour are considered here.

“Bees need food (nectar, pollen) provided by insect-pollinated plants in order to reproduce and produce more bees” (Corbet, Williams, & Osborne, 1991, p 2). By creating hives and environments that are conducive to bee sustainment, it is possible that strides can be to reverse the downward trend in populations. This is critical as one study showed. It stated that the loss of bees was a domino effect to other species. It stated, “If bee pollinated flowers

Natural selection is considered to be the primary mechanism by which Evolution happens. Darwin posited that because any species can exceed the resources necessary to sustain life, a struggle for existence develops. In this struggle, “individuals with heritable traits that increase survival and reproductive success will pass on those traits to their offspring while those that do not will tend to be eliminated.” It is interesting to note that Darwin’s thoughts on natural selection were heavily influenced by Edward Blyth. Blyth, however, viewed natural selection as a conservative process whose goal was to keep organisms essentially unchanged.

Charles Darwin first idealized natural selection as species changing in an orderly manner (Cacioppo, Freberg 2013). This manner could include an animal like a rabbit, which would survive when it is faster rather than slower. Then in the next generation, faster rabbits would start to appear more because the previous generation’s mates were more commonly the faster rabbits. Therefore, an organism that survives to reproduce passes on those positive traits along, but organisms who do not reproduce do not pass down those negative traits. Natural selection favors the organism with the highest degree of fitness, defined as the ability of one genotype to reproduce relative to other genotypes (Cacioppo, Freberg

Darwin’s theory of evolution proposed a mechanism for decent with modification. His studies resulted in the proposal of two forms of selection, including sexual selection and natural selection. (3) The concept of sexual selection was developed by Darwin to account for many adaptations that appear incompatible with natural selection (3). Natural selection is a major component of evolution however it is still not fully understood. (2)

Charles Darwin originally argued that all existing organism are the modified descendants of one or a few simple ancestors that arose on Earth in the distant past (Smith, 1989). Darwin also argued that the main driving force of evolution is what he defined as natural selection. Natural selection is the process that reproductively successful or environmentally well-adapted traits of individuals, is often as a result of mutation, inherited and become a part of a population’s traits through generations (Bell, 2008). In simple words, natural selection is a change in an allele frequency in a population over time. In order to prove this idea, Darwin carried out artificial genetic

In this work, Charles Darwin frequently observes and references the variation in traits amongst individuals in a population. He observed that nature selects from existing varieties the traits most suited for a particular environment. He also proposes that species descend from common ancestors, undergoing various modifications in the course of time. This concept is described by Darwin as “descent with modification” or the new variations present in new generations resulting from natural selection. One of Darwin’s more convincing points is made by way of metaphor. He wrote, “The face of Nature may be compared to a yielding surface, with ten thousand sharp wedges packed close together and driven inwards with incessant blows, sometimes one wedge

One of the first and central mechanisms proposed by Darwin during his life was that of "natural selection." Some may refer to this as "survival of the fittest," whereby species that produce offspring have been successful in doing so because they have produced random individual features which have lead them to live longer and pro-create offspring with the same inheritable desired features. Not all individuals will be able to reproduce, therefore only the fittest will…"multiply, vary, let the strongest live and the weakest die," (Darwin, Charles (1968, 1859)) Origin of the Species.

An oxymoron appeared to exist between Darwin’s theory of natural selection (1859) and the definition of altruism (West et al., 2006). Hamilton’s theory of inclusive fitness (1964) appeared to mediate this problem. However, the theory does not explain altruistic acts towards non-kin in line with natural selection. Reciprocal altruism (Trivers, 1971), indirect altruism (Alexander, 1987) and strong reciprocity (Gintis, 2000) have been proposed to resolve this conflict. It is of note that behaviour in all theories has been noted in animals, but will not be discussed further. Instead, the essay will focus on which theories are most relevant when understanding human sociality, with the author explaining why no sole theory is seen to describe the phenomenon. All theories will be discussed in relation to evolutionary stable strategies (ESS), which refers to plans that when adopted by a majority of members in a population that restrict any other action existing, which could yield higher reproductive success (Smith & Price, 1973).

Natural selection is one of the most significant methods in which evolution can occur in a population that was proposed by Charles Darwin, among other scientists, in the 1800s. The term summarizes the concept that heritable traits that are able to survive, due to fitness for their environment, and successfully reproduce will likely become more common among a population. On the other hand, natural selection also includes the idea that heritable traits that either cannot survive, or have unsuccessful reproduction will become less common in a population. Other aspects of natural selection as a whole include evidence from various scientific fields, the key points of the process, its causes, and its effects.

Many scientists believe variations are caused by environmental factors, such as food availability, weather and more; and that species evolve when environmental conditions change to increase the species survival. Darwin censures this idea; he believed that the main cause of variation is due to reproduction (Chapter I). Darwin suggested that parents pass down specific characteristics to their offspring, and those variations are continued on in the following generations. The problem with Darwin’s theory of reproduction is that Darwin did not comprehend how or why some characteristics are perennial and how others are not. Darwin’s inferences on variations also conflict with the idea that God created species independently, which was widely understood by many people in a time where religion was prominent (Chapter II).

The theory of evolution by natural selection (Darwinism), first formulated in Darwin 's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioural traits. Changes that allow an organism to better adapt to its environment will help it survive and that have more offspring. The first three ideas were already under discussion among earlier and contemporaneous naturalists working on the “species problem” as Darwin began his research. Darwin’s first contributions were the mechanism of natural selection and numerous amounts of evidence for evolutionary change from many sources. He also provided thoughtful explanations of the consequences of evolution for our understanding of the history of life and modern biological diversity.

Some reasons why beaks were thought to be so useful for testing Darwin’s theory of natural selection was because it seemed that the more favorable variations in their beaks will be passed down. Another reason was because there were more variations in the beaks depending what the finches ate so he could study a variety of beaks.

Charles Darwin was a man who shaped the way in which we think about evolution in modern times. He brought forth and described the theory of natural selection and survival of the fittest. To fully understand modern evolutionary thoughts it is necessary for one to completely understand the early theories of Charles Darwin. In this paper I will provide the reader with a complete background on Charles Darwin, describe his voyage on the HMS Beagle, and discuss his theory of natural selection.

If these traits that it possesses that made it different were useful than that creature may reproduce more than normal. Of course in Darwin’s day DNA had not been discovered but it was known that traits were passed to offspring. Natural selection is when the organisms with good traits survive the trials of nature. Artificial selection is what breeders do, the cow that gives more milk, or the plant that produces larger fruit are selected to be reproduced. Encyclopedia Encarta defines natural selection as “the process by which environmental effects lead to varying degrees of reproductive success among individuals of a population of organisms with different hereditary characters, or traits. The characters that inhibit reproductive success decrease in frequency from generation to generation. The resulting increase in the proportion of reproductively successful individuals usually enhances the adaptation of the population to its environment”