Four Forces of Evolution Essay Example | Topics and Well Written Essays - 500 words

Four Forces of Evolution - Essay Example It is worth denoting that the four forces often correspond to changes in the frequencies of allele, genetic drift, natural selection, mutation, gene flow, and genetic hitchhiking. Natural selection focuses on the evolution of species. It is denoted that specie is a fundamental unit of biological categorization and a taxonomic position. This is one of the fundamental grounds of evolutionary theory. Natural selection attempts to highlight dissimilarities in characteristics among species such as coloring. The major premise of natural selection is that a trait that allows a person to survive in an environment usually triumphs. Natural selection happens after the meeting of reproduction, variation in offspring numbers per person, variations in the physical attributes, and heredity condition (Ruse and Joseph 136). Variation within the evolutionary world focuses on the distinctive characteristics that define organisms, as well as their actions. Mutation is a significant variation source, and work as an evolution mechanism when there are contrasting probabilities at the level of molecules for varied mutations to happen. This procedure is regarded as mutation bias. Supposing two genotypes, one having nucleotide G and the other with nucleotide A within a similar position possess similar fitness, even though the mutation from G-A occurs more frequently compared to the mutation from A-G, then genotypes within A will evolve. Deletion mutation and different insertion biases within contrasting taxa can result to the evolution of dissimilar genome sizes. Mutational or developmental biases were also observed under morphological evolution (Ruse and Joseph 154). Genetic drift signifies alterations within the frequencies of alleles from a generation to the subsequent due to subjecting alleles to sampling errors. Accordingly, when the selective forces are relatively weak or