Evolution Paper Assignment
1. Evolution is the change a population undergoes over time. The theory of natural selection is a mechanism of evolution. It that states the organisms among a population that have traits which allows them to have greater reproductive success will become more prevalent over time. Fitness is the term to measure how reproductively successful an organism is. Evolution by natural selection produces organisms that are adapted to their current, local environment but are not perfect. This can be demonstrated through the Italian wall lizard. Scientists conducted an experiment in 1971 where they placed ten pairs of Italian wall lizards onto the island of Pod Mrčaru, an island foreign to this species of lizard (Listverse 2011). After 36 years of letting the lizards roam the scientists discovered new adaptations in the lizards. On their homeland they ate predominately insects, whereas in the new habitat they are mostly vegetation. Due to this, their heads become longer, wider and taller while inhabiting the new island. Plants are tougher to eat and digest than insects, so a bigger head would give them an advantage over lizards that did not have a large head. The abundant food source allowed the lizards to reproduce easier (Johnson 2008). Another adaptation the lizards underwent pertains to their digestive system. They began to produce cecal valves in their guts because the lizards were eating many more plants than previously in their original environment. These valves slow the digestive process down, making it easier for the body to absorb all the nutrients possible from the hard-to-digest plants. These valves are thought by researchers to be caused by a random mutation (Johnson 2008). Mutations cause genetic variation in a population, which would explain why the lizards evolved so rapidly. This is significant because no other species of lizards have been found to have them but hatchlings, juveniles, and adult Italian wall lizards were all found to have them after being on the island (ScienceDaily 2008). The Italian wall lizard can then be said to have gone through evolution because it has undergone a genetic change over time. This evolution was necessary in order for the organism to survive in the new environment. This example demonstrates evolution by natural selection because it covers the three requirements of natural selection: variation of a trait, heritability, and differential reproductive success. Both head size and cecal valve presence show the variation from organism to organism, covering the first point. Certain traits may be more advantageous in the new environment, but it is still possible for some organisms to not develop them, or for them to develop at different rates, causing them to vary. Heritability just means that the traits can be passed down from parents to their offspring, which is the case for both head size and cecal valves. It also meets the requirement of differential reproductive success because only the organisms with larger heads and cecal valves can compete, survive, and reproduce adequately. Without these two functions the lizards would not be able to sustain themselves in a vegetation covered environment (Johnson 2008).
2. Researchers have discovered in prehistoric humans that the mutation that turns the lactase gene on permanently was not present, while now it is common (Berkeley 2007). Human’s ability to digest lactose has been evolved since humans domesticated cattle, which was approximately 7500 to 9000 years ago (Berkeley 2007). The evolution of lactose tolerance is occurring because more and more regions are adopting milk products as sources of nutrition. The mutation is random but was, and still is, favored by populations that have a convenient milk supply, as it is more advantageous to people in those regions (Berkeley 2007). Scientists believe that the allele for lactase persistence (lactose tolerance) most likely came in response to strong selection for the
Cassidy Emmett Mrs. Warrem Bio 1 Period 2 Evolution Theory Charles Darwin is best known for his contributions to evolutionary theory. It was his theory that all species of life descended over time from common ancestors in a process that he called natural selection. He was an English naturalist and a geologist. He studied medicine and the University of Edinburgh. He also studied at the University of Cambridge which encouraged his passion for natural science as he helped to investigate marine…
Biology Collin Carlton October 14, 2014 11a Evolution in Biology is described as “the theory that groups of organisms change with the passage of time, mainly as a result of natural selection, so that descendants differ morphologically and physiologically from their ancestors”1 Biological evolution is a powerful and important process. It is a process which, over time, slowly selects the organisms that are better adapted to their environments, and takes advantage of random mutations to continuously…
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…
Custom Research Paper on Evolution for you! Moreover, evolution does not only influence appearance, but the qualities and abilities of biological species. For example, in order to survive, animals, birds, fish became very fast, possess extremely developed smell, eyesight and especially, their ear is very sensitive and hears a lot. Evolution is the process which lasts millions of years, species change constantly and gradually all the time; the process is active even now. Evolution vs creationism…
Evolutions take home test Prepared for: Ms. Collver Prepared by: Laurann Byrde Date: March 28, 2014 Class: Science 8th Do you believe in evolution? Do you believe that use as people evolved of monkeys? If you answerer is I don’t know or I never thought of it, then my paper will help you to make up your mind. In my paper I will include the following: what is evolution, is evolution wrong? How is evolution different from intelligent design/creationism? How do Christians refute…
scientists of evolution Stephen Gould Stephen Gould lived in America, and was born september 10th, 1941, and died may 20th, 2002. Some of his main findings, publications, and contributions was his most important contribution which was the theory of punctuated equilibrium in 1972. This theory suggests that most evolution is marked by long periods of evolutionary stability. He also contributed to evolutionary developmental biology. In evolutionary theory he opposed selectionism, sociobiology…
Research Paper: The Butterfly Gland Emily Loney Science and the Bible Rob Buzza March 22, 2013 If one, thought to be unimportant, organ didn’t exist… neither would you. There has been and still is much ongoing debate between the theories of evolution and creation. One form of evolution called ‘naturalistic evolution’ is defined as “A gradual process in which something changes into a different and usually more complex or better form”. In this paper I will be using one argument to disprove…
Vandercook Eng. 104 Anthony Sassin The Evolution of Language Annotation They provide an approach to language evolution based on evolutionary theory. They explore the ways in which languages can evolve in a society and how specific signals can become associated with specific objects. Errors were common in language but they worked it out as evolution evolved. They show how words can be combined into sentences and specify the conditions for the evolution of very simple grammatical rules. Written…
Charles Darwin: The Father of Natural Selection Charles Darwin is the biggest figure of evolution and exemplifies why it is so important to science today. Evolution is something that I’ve always been interested in and something that sciences leans back on time after time. Everything thing that scientists talk about or studies about can be linked back to evolution. He makes it apparent in his essay and how fundamental natural selection is. His ideals on natural selection explain everything that has…
Evolution Abstract The process of elimination through means of adaptation is a result of evolution. By multiple attempts made, it was determined that evolution is made possible by carefully selecting ways to become hard targets for prey. This experiment was conducted using a multi-colored fabric background as the environment and using paper hole punch cut-outs as the prey. With every cycle of remaining prey, it was determined that the colored hole punches that most resembled the back ground…