What is evolution and how does it work? Evolution is the theory of how one form of life changes into another form. Evolution also is the change of a population’s inherited traits from generation to generation. Evolution helps to explain why an animal, human, and plant looks the way it does and acts the way it does; it gives an explanation of the history of life. Genes come in many varieties and the evolution helps to make it happen.
Essay on Evolution There are many mechanisms that lead to evolutionary change. One of the most important mechanism in evolution is natural selection which is the differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment. Natural selection occurs when a environment makes a individual adapt to that certain environment by variations that arise by mutation and genetic recombination. Also it favors certain traits in a individual than other traits so that these favored traits will be presented in the next generation. Another mechanism of evolution is genetic drift.
A population is a collection of organisms of the same species living in a particular area at a particular time. This is because all populations have some variation in genotype (genetic makeup). The phenotype, which is the appearance, of natural population varies as well. The likelihood of an adjustment in a population depends on the interaction between genes and the environment. Selection Pressures are factors that influence the survival of an individual, a population or a species.
Charles Darwin, the father of evolution theories, stated that the intelligence or the strength of specie does not guarantee its survival and the continuation of its genetic line. The individual in a species with the suitable genetic material will continue to exist if sudden changes that require adaptation quickly bloom. These traits, which are not necessarily desirable, allow the individuals that contain them to live on and will be passed on from generation to generation. He describes these individuals as being ‘responsive to change’ because he sees them as the most sensitive to disturbances. So that they adapt quickly or prepare themselves to do so.
The process of natural selection supports the idea of survival of the fittest and plays a key role in evolution. For species to evolve, there must be diversity present. When diversity is acted upon, a mutation happens. Mutations are alterations that happen in the genes, or the result of genes not being able to copy themselves properly. At first, mutations may seem almost non-existent to the eye, but over time the mutation will become more visible.
Genetic drift is where there is a change in the genetic makeup of the next generation due to a change in the allele frequency in the next generation. This occurs all by chance alone, and may have its greatest impact on smaller populations than larger ones. The change in allele may or may not be for the better. When the sequence of a gene is modified due to a mistake it is a mutation. If the mutation is advantageous to a species, such no longer being susceptible to a pesticide, increases gene variation for future generations.
Within these organisms there are different variations. Those variations are then inherited from parent to offspring; generation after generation. The organism with inherited characteristic that help with survival and reproduction are selected amongst the different variations of that organism. They are then able to reproduce more than others and therefore they are able to pass down their traits to one generation on to the next. Darwin’s theory of natural selection explained adaptations that helped a species to survive.
A mutation that may be an advantage to a pressure in a specific environment may end up changing again to increase advantages in the next generations. Adaptations will change with the environment to create new species and morphologies for best fit species and ultimately for survival. However, mutations occur depending on the population size, a small population may not be able to mutate and adapt as fast as a large population can. A large population tends t... ... middle of paper ... ...being able to pass their genes on from generation to generation. The last disadvantage of sex is recombination.
Evolution, what is evolution? Evolution is the process by which different kinds of organisms have changed and adapted from their earlier forms. Evolution relates so closely to biology because biology is the study of life and evolution is how living organisms have adapted to the environment. My goal for this paper is to explore evolution in mammals, the basic theory of evolution, beliefs of evolution, the main contributors of evolution, evolution in humans, evolution in monkeys, things that humans lost from evolution, as well as extinctions. I became interested in this topic because it hard for me to think at one time humans had tails, or that some species of ape’s DNA is very similar to ours.
In somatic cells, added genes alter the genetic makeup of the body while in germ cells, alteration is to the reproductive cells. Genetic modifications have been widely exercised in plants. However, the exercise is limited in humans due to ethical issues. With genetic modification, the evolution of new beings that are stronger and disease-free can be enhanced. However, one concern surrounding the practice is that it would upset the balance of life.