ipl-logo

Natural Selection Hypothesis

847 Words4 Pages

In population genetics aspects, we can infer that we agreed that evolution happened. Darwin 's Theory of Evolution by Natural Selection is also one of the best explanation for the existence of evolution. Why do we agree that evolution exist based on prove in population genetics? The involvement of genotype factors show how an organism evolved over time. This can be relate to Darwin’s theory too in which in natural populations, the genetic composition of a population 's gene pool may change over time. Before Darwin 's time, science knew that life evolved, since they saw the fossil and their resemblance to extant life. And many hypotheses had been proposed before Charles Darwin 's idea. Darwin identifying natural selection as the mechanism for …show more content…

Unfortunately, he did not have a good explanation for how new traits were formed, as there was very little knowledge of genetics at the time. We now know that genetic mutations provide the possible traits for natural selection to act upon. So, mutations provide the traits and natural selection weeds out the traits that do not work, leaving the best to carry on.
Other than that, with evolution can happen due to mutation which happened and it change the genotypic and phenotypic of an organism overtime. Mutation is the primary source of new alleles in a gene pool, but the other factors act to increase or decrease the occurrence of alleles. Mutations are classified as beneficial, harmful or neutral. Harmful mutations will be lost if they reduce the fitness of the individual. If fitness is improved by a mutation, then frequencies of that allele will increase from generation to generation. The mutation could be a change in one allele to resemble one currently in the population, …show more content…

Mutations are generally deleterious and are selected against. But the genome of a species can undergo another type of change, gene duplication, which actually favors mutational events. If a single gene that is important undergoes a duplication, mutation in the duplicated copy would not necessarily reduce the fitness of the individual because it still would have a functioning copy of the original gene. With this adaptive constraint removed, further changes can occur that generate a new gene that has a similar function in the organism, but may function at a specific time in development, or in a unique location in the individual. This type of evolution generates multigene families. Many important genes such as haemoglobin and muscle genes in humans and seed storage and photosynthetic genes in plants are organized as multigene families.
The process of evolution is slow and continuous. We have seen that many generation of persistent selection are required to drastically reduce the frequency of an unfavourable mutant gene in the population. Likewise, it generally takes an inordinately long period of time for a new favourable mutant genes to replace its alleles throughout a large population. We have encountered situations in nature which a favourable mutation has spread throughout a population in a comparatively short span of

Show More
Related
648 Words | 3 Pages

1. A viruses is a non-living infection agent and can be found anywhere. it has no cell organelles. They are eliminated by the immune system. Viruses are the smallest in size of all the microbes.

Read More
1156 Words | 5 Pages

Over the eras, many scientists have expressed concerns with Darwin's evolution theory and in "Was Darwin Wrong?" by David Quammen one can learn about the proof behind the theory of evolution. Many people do not believe in evolution due to an overall unawareness about the theory and religious upbringing. However, Quammen clarifies the truth behind evolution in his article. The article states five positions of evidence biogeography, embryology, morphology, paleontology, and the bacterial resistance to antibiotics discovered in humans.

Read More
1668 Words | 7 Pages

1 )artificial selection in current world? Answer : Artificial selection is the process of changing the characteristics of animals by artificial means. It was originally defined by Charles Darwin in contrast to the process of natural selection, in which the differential reproduction of organisms with certain traits is attributed to improved survival and reproductive ability in the natural habitat of the organism. For example, animal breeders are often able to change the characteristics of domestic animals by selecting for reproduction those individuals with the most desirable qualities such as speed in racehorses, milk production in cows, trail scenting in dogs.

Read More
837 Words | 4 Pages

In addition, scientists use the homologous structure as evidence for evolution by using structures with different appearances and functions that derived from the same body parts in a common ancestor. Furthermore, natural selection is evidence for evolution because for example, when Darwin collected birds they were a closely related group of distinct species, but the different beak shapes were related to food gathering. Artificial selection is another piece of evidence for evolution in which operates by favoring individuals with certain phenotypic traits allowing them to reproduce and pass their genes to the next generation. Overall many biologists accepted Darwin’s theories but there are some objections such as how evolution is not demonstrated, no fossil intermediates, the intelligent design argument, evolution violating the second law of thermodynamics, proteins are too improbable, the irreducible complexity argument, and how natural selection does not imply

Read More
926 Words | 4 Pages

It may be common knowledge to know that Creationism was a principle theory in the realm of science during this time period. Creationism was taught in our schools and institutions, but during this age that mentality took a pivotal shift. Creationism, which is believe in a supernatural creator came under threat by rising, new theories. Theories such as Darwinism began there moment of birth during this time period. It would be by the writing’s of Charles Darwin that society would come to know of Darwinism.

Read More
411 Words | 2 Pages

In this passage, Jane is delivering a letter to from Thornfield to Hay for Mrs. Fairfax and is describing her surroundings. She had been working as a governess for Adele and was tired of being staying inside the house all the time. Brontë incorporates both long sentences and imagery to provide vivid descriptions and develop Jane’s environment. The setting Brontë describes provides the reader with a visualization and reflection of what is occurring in the novel. With this detailed depiction, Brontë establishes the setting before latter events such as when Jane meets Rochester for the first time; Brontë also accordingly adjusts the description of the setting and breaks the serene landscape previously painted.

Read More
761 Words | 4 Pages

Critical thinking questions: physical anthropology textbook 1. Given that you’ve only just been introduced to the field of physical anthropology, why do you think subjects such as skeletal anatomy, genetics, nonhuman primate behavior, and human evolution are integrated into a discussion of what it means to be human? The study of physical anthropology integrates the subjects of skeletal anatomy, genetics, nonhuman primate behavior, and human evolution because anthropologists look to the fossilized remains of hominins to see what their environments were like and what they ate. In addition to these sub fields, anthropologists look to skeletal anatomy to see any evolutionary change or if the hominin had died from any diseases and how old and tall

Read More
701 Words | 3 Pages

Given the fact that the nature of the warring personalities are significantly different, the clashing of ideas with regard to the theory were inevitable. Charles Darwin’s claim was that organisms went through several processes that made them what they are now or the principle of natural selection, whereas, William Paley’s argument is that organisms were created as they were by one “creator” which is God. The former’s claim is more inclined to the principle of evolution while the latter’s argument mainly centers on “natural theology” and the “designer

Read More
2065 Words | 9 Pages

So, the genetic diversity or the variety of different genotypes will be severely reduced in modified communities. Also, the ability to survive directly depends on genetic diversity because populations without it will not be able to meet the demands of the environment (Wolfe, Christian). A disease that could be survived by a population with the normal human genetic diversity, would wipe out the modified community without the genetic diversity. Changing the genotype of just one can affect the whole diversity of humans and with the many processes, including sterilization and genetic screening, changing the genotype of one comes with ease. The ease of changing one leaves humans at a point where the achieved diversity can be easily destroyed, further placing them at risk through the threat of disease (Wolfe, Christian).

Read More
283 Words | 2 Pages

Charles Darwin has impacted the world of science by believing in theory of natural selection and evolution. Darwin was born in Shrewsbury, the date February 12, 1809. When Charles was twenty-two he began a five-year voyage. He studied specimens all over the world which drove him to develop his approach on evolution and natural selection. Charles Darwin announced his concept of evolution publically at a meeting of the Linnean Society.

Read More
930 Words | 4 Pages

Darwin changed the way that scientist looked at evolution during his time, Darwin and his book The Origin of Species are what made evolutionary biology what it is

Read More
609 Words | 3 Pages

But when it comes to us evolving, many scientists believe that we have stopped. They claim we are close to the end of human evolution because of all the genetic engineering and medicinal use, that is causing us now not to evolve naturally by natural selection, and survival of the fittest but by our own means. But at the same time, with all the evidence that scientists like Elisabeth Bolund of Uppsala University in Sweden show, one could argue that we are still evolving. This evidence being that between 4 and 18 percent of the variations among individuals in lifespan, family size and ages of the first and the last childbirth are influenced by genes.

Read More
1250 Words | 5 Pages

Charles Darwin became famous for his theory of natural selection. This theory suggests that a change in heritability traits takes place in a population over time. This is due to random mutations that occur in the genome of an individual organism, and offspring can inherit these mutations. This was defined as the key to evolution, this is because random mutations arise in the genome of an individual. Until the 19th century, the prevailing view in western societies was that differences between individuals of species were uninteresting departures from their platonic ideals of created kinds.

Read More
1666 Words | 7 Pages

The Evolutionism or Creationism Debate The evolutionism-reationism debate has been going on for centuries among christians and scientists. However, creationism is said to have more logical proof of their points being the strongest. According to Charles Darwin, Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.

Read More
1251 Words | 6 Pages

Population evolution can occur by genetic drift; this is a change in the gene pool of a small population due to change. Gene flow is also a cause of population evolution, this happens when a population loses or gains alleles by gene flow. Natural selection also causes population evolution, this promotes evolutionary adaption. The general outcomes of natural selection are directional selection, disruptive selection, and, stabilizing selection. Population evolution can also occur by sexual selection.

Read More

More about Natural Selection Hypothesis

Related Topics

Open Document