Natural Selection and Darwin
In Darwin's time most scientists believed that each organism and each adaptation was the work of the creator., but theories began to develop by a number of historians stating that evolutionary changes were an effect to changes in nature. There were many reasons for this, such as geological studies were reveling that the earth was much older than stated in biblical creation. Another reason was the similarities between different organisms. When Darwin traveled to the Galapagos Islands he noticed slight variations that made tortoises from different islands distinct. He also observed from island to island the vast number of finches had slight differences. Darwin also noticed that they all seemed to resemble the main finch on the mainland of Equador. This observation had great influence of Darwin's thinking and he began to formulate his Theory. Darwin's theory of Evolution consists of four main parts. The first one was that organisms have changed over time and the ones living today are different form those of the past also many organisms have become extinct over time. The second part was that all organisms are derived by common ancestors by the branching process. Populations split into different species but they all have one
Convergent Evolution is when two unrelated species share similar traits. These similarities occur because these species have adapted to similar ecological conditions or lifestyles, not because they have a common ancestor. An example of this would be the fins of sharks, and penguins, they both developed because of their surrounding aquatic environment requires them to have this feature not because they are linked to each other genetically. This relates to evolution by natural selection because it shows how these two species evolved due to their environmental conditions, those that did not develop fins will not be able to survive in this aquatic environment deals with the part of natural selection dealing with characteristics of organisms and how these characteristics are essential in the battle to survive. 3) Natural selection and heterozygote advantage. The heterozygote advantage occurs when the heterozygous condition bears a greater advantage in Natural selection than the homozygous conditions. It is a way of preserving variation in the environment. An example of this would be found in the crossbreeding of crop plants. When the corn is inbred the number of homozygous gene loci increases and the corn may become stunted in growth and susceptible to many diseases. This shows how variation occurs within natural selection and within the environments that these organisms are located. common ancestor. This part of the theory provided an explanation as to why similar species tended to be in the same geographical area. The third p
Some common words found in the essay are:
Natural Selection, Directional Selection, Convergent Evolution, Theory Darwin's, , Galapagos Islands, natural selection, survive reproduce, evolution natural, theory evolution, evolution natural selection, darwin's theory evolution, darwin's theory, battle survive, Darwin's Theory, Evolution Natural, Theory Evolution, insecticide resistant insects, trait example, directional selection, theory evolution natural, convergent evolution, resemble parents, battle survive reproduce,
Approximate Word count = 1045
Approximate Pages = 4 (250 words per page double spaced)
|
