Which of the following statements describes the process of natural selection?

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Natural selection:It is a key mechanism of evolution. It is the differential reproduction and survival of an individual as a result of variations in the phenotype. Variations of inheritable characteristics are seen in a population over generations.Through this mechanism, living entities change and adapt to their environment.Natural selection is a process governed by changes in environmental factors, these factors produce stress on the organisms. That compels the organisms to undergo changes, in case the organism undergoes changes suitable to the environment, that is, it is suited to survive in the environment and will also pass on those traits to the next generation until the next change occurs.In a population, individuals are naturally variable hence, some of these individuals, as a result of the variations possess characteristics that are better suited to the ambiance compared to the others.

Well adapted individuals leave more offspring than poorly adapted individuals and thus, they contribute more gene pool to next generation

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Adaptations beneficial in one given condition should be beneficial in all other conditions too

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Different species that occupy a habitat would have undergone the same genetic changes

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Solution

The correct option is A Well adapted individuals leave more offspring than poorly adapted individuals and thus, they contribute more gene pool to next generationAccording to natural selection, individuals who survive better and utilize resources in a given condition contribute more offspring for the next generation as compared to poorly adapted individuals in the same conditions. This might have been the basis of speciation over many generations. Darwin referred to this as the survival of the fittest. Adaptations are specific to conditions and different environmental conditions may necessiate different adaptations for better chances of survival. Further different species would have undergone genetic changes different from one another as the variations within these populations are different, to begin with.

English naturalist Charles Darwin developed the idea of natural selection after a five-year voyage to study plants, animals, and fossils in South America and on islands in the Pacific. In 1859, he brought the idea of natural selection to the attention of the world in his best-selling book, On the Origin of Species.

Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others. Individuals with adaptive traits—traits that give them some advantage—are more likely to survive and reproduce. These individuals then pass the adaptive traits on to their offspring. Over time, these advantageous traits become more common in the population. Through this process of natural selection, favorable traits are transmitted through generations.

Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species. It is one of the processes that drives evolution and helps to explain the diversity of life on Earth.

Darwin chose the name natural selection to contrast with “artificial selection,” or selective breeding that is controlled by humans. He pointed to the pastime of pigeon breeding, a popular hobby in his day, as an example of artificial selection. By choosing which pigeons mated with others, hobbyists created distinct pigeon breeds, with fancy feathers or acrobatic flight, that were different from wild pigeons.

Darwin and other scientists of his day argued that a process much like artificial selection happened in nature, without any human intervention. He argued that natural selection explained how a wide variety of life forms developed over time from a single common ancestor.

Darwin did not know that genes existed, but he could see that many traits are heritable—passed from parents to offspring.

Mutations are changes in the structure of the molecules that make up genes, called DNA. The mutation of genes is an important source of genetic variation within a population. Mutations can be random (for example, when replicating cells make an error while copying DNA), or happen as a result of exposure to something in the environment, like harmful chemicals or radiation.

Mutations can be harmful, neutral, or sometimes helpful, resulting in a new, advantageous trait. When mutations occur in germ cells (eggs and sperm), they can be passed on to offspring.

If the environment changes rapidly, some species may not be able to adapt fast enough through natural selection. Through studying the fossil record, we know that many of the organisms that once lived on Earth are now extinct. Dinosaurs are one example. An invasive species, a disease organism, a catastrophic environmental change, or a highly successful predator can all contribute to the extinction of species.

Today, human actions such as overhunting and the destruction of habitats are the main cause of extinctions. Extinctions seem to be occurring at a much faster rate today than they did in the past, as shown in the fossil record.

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