According to Darwin and his theory on evolution, organisms are presented with nature’s challenge of environmental change. Those that possess the characteristics of adapting to such challenges are successful in leaving their genes behind and ensuring that their lineage will continue. It is natural selection, where nature can perform tiny to mass sporadic experiments on its organisms, and the results can be interesting from extinction to significant changes within a species.
When a species gives rise to a new species the small group breaks away and becomes geographically/reproductively isolated from its ancestral group. As long as it remains small and detached, the founder group can experience fairly rapid genetic changes.
This occurs when a species is separated and mate with a different species, changing their genetic composition, if then the two species were to be brought back together and mate again, it would cause what is called ‘gene migration’. This process gives so many different variations among the species, which allows more and more variation and population. This process also explains endangered species and extinction.
Over the last several years, evolution has been playing an increasingly important role in determining how various species are evolving. This is because ecology will have an impact on how quickly a particular organism is able to adapt (with: the unique challenges for a particular environment). To determine the effect that this is having requires carefully examining different species over the course of many years. This will be accomplished by comparing these changes on Darwin and Wallace Islands. Once this occurs, is when specific insights will be provided that are highlighting the underlying challenges affecting the development of organisms. This is the point that these transformations will be evident among the various life forms. (Fasolo, 2011, pp. 53 68)
The Evolution Lab simulates environmental situations to determine effects on evolution over periods of time. This lab experiments with the evolution of finches on two different islands over 100, 200, and 300 years. By manipulating parameters that influence natural selection, the effects that natural selection have on the evolution process can be studied.
The setting in the two novels plays important roles in both of the plots. In The Butterfly Revolution, the setting shifts in the very beginning of the story. In the journal Winston Weyn receives for his birthday from his uncle, he describes his home. Winston also shares with us that from his parents he half-heartedly accepted a trip to High Pines for the summer. Winston was not like most boys, and instead of playing baseball and doing things that most boys do, he read books. This bothered his brother Howard, which just encouraged Winston to read more and more. His father and mother, both concerned, had multiple talks with Winston but none of these talks resulted in anything. “And here I am, sitting on a thin and kind of smelly narrow mattress on my bunk in a cabin at High Pines” (22). He went from the comfort of his own bed to the smelly mattress of High Pines. The central conflict of the story begins at the camp. This shift of setting allows the real story to begin. Later in the novel, the setting shifts again. Some of the boys begin to venture off into the girls camp, or Low Pines. After the revolution has begun, they take over the girl camp, also. If the girls’ camp was not involved, two out of the three deaths would have been prevented. John Mason would not have died under the
2. Allopatric speciation occurs due to a geographic isolation process such as when a pond might dry up and create two ponds, a flood, a river is re-routed, or a bird carries seeds in its feathers and drops the seeds in new location during the birds migration. The species of the previous geographic location also become reproductively isolated. The population then becomes two separate populations and begins to change over time due to changes in the gene pool, environments, natural selection and mutations. With this understanding it is possible to see that plate tectonics theory and continental drift theory possibly resulted in allopatric speciation.
Natural selection is an important component of evolution. Natural selection occurs when some members of a population are better fit for survival and reproduction than the others in that population (Phelan 284-85, 2011). The environment in which organisms live plays a part in natural selection as well. Depending on the conditions of the environment, the organisms may pass down selected traits to their offspring. These selected traits will allow for the next generation to better adapt and survive longer. One example of evolution that has occurred in the past ten years is that of hypolimnas bolina, or the blue moon butterfly. The blue moon butterfly evolved through the process of natural selection in order to survive. The male blue moon
The main claims of evolution are that all species are connected, species change, and that genes of different species are not identical due to mutations. PBS’s film, What Darwin Never Knew, explains that “all species are connected and they change through Darwin’s ‘descent with modification’ theory” (What Darwin Never Knew). The species are connected, yet varying through mutations. “Mutations are a critical ingredient in the recipe for evolution. Without mutation, everything would stay constant, generation after generation. Mutation generates variation, differences between individuals” (What Darwin Never Knew). In different species, most of the DNA is similar, with the exception of one different sequence. The mutations can cause changes between species, causing variation. Overall, it
"We cannot allow our children to grow up in this corrupt and tyrannical regime, we have to ﬁght against it, and I am willing to give up everything, including my life if necessary." (Patria Mercedes Mirabal)
In the case of ring species, natural selection and sexual selection each play a role in the divergence of ring species. Selective pressures allowed one phenotype to survive better than others in a certain area; sexual selection could cause divergence because organisms choose mates based on phenotypes. In the case of salamanders, natural selection affected divergence because organisms with certain coloration survived better in coastal or inland environments. In warblers, sexual selection and natural selection seem to play a part in the divergence of the ring species, as forest density and migration distance is variable and affects survival of the species. Molecular and morphological evidence can be used to support multiple species by showing
Natural selection is considered one of the most important processes for a variety of species and the environment which allows the fittest organisms to produce offspring. To prevent a species from extinction, it is necessary for them to adapt to the surrounding environment. The species which have the ability to adapt to new surroundings will be able to pass their genes through reproduction. Within the process of natural selection, it is possible for the original genetic make-up of a species to become altered. The team will report on the different processes of basic mechanisms of evolution, how natural selection results in biodiversity and why biodiversity is important to continued evolution. The sources of genetic
Natural selection is a key mechanism in evolution that explains how phenotypes that permit greater reproductive success can create large-scale changes and divergences in species or creatures. The core idea is that it happens over time by itself in nature through reproduction. This was a great contrast to many other theories at the time like Lamarck’s whose Theory of Inheritance of Acquired Characteristics stated that changes that happen to a creature during its lifetime will be passed down to its offspring. The best way to visualize Darwinian theory is through the Galapagos finches that helped lead Darwin to his finding. In the Galapagos Islands the finches on isolated islands all originated from the
“The simple observation of the frequency of synonymous mutations in different species is the strongest argument for common descent that we can imagine. I can’t really think of any possible alternative explanation for that simple and universal fact.”