MAJOR ISSUES IN EVOLUTION
Charles Darwin is considered the father of the evolution theory. He proposed that differences do occur in surviving offspring and produce those that do not. In a sense, individuals who have the heritable characteristics making them survive in their environment will produce with the same heritable characteristics. In essence, nature contributes to the selection of individuals best suited for specific environments. This is the foundation of the selection theory. The aspect of natural selection explains varying traits among individuals of the same population. This is also used to explain the species found in fossils. However, there have been several critics of this theory. For instance, Theodosius Dobzhansky asserted that nothing in biology makes sense regarding evolution. He wonders what happens if the theory is true and the expected consequences. This discussion is focused on analyzing the assertions of Theodosius Dobzhansky in light of evolution.
The central requirement of natural selection is variations happening within a given population. However, this is an assertion that brings about contradictions in the theory of natural selection, which forms the basis for evolution. The question that Darwin never answered is the source of these variations. However, modern genotypes have highlighted a possible source of the ultimate variation of species in a population. (West-Eberhard, 2003). The modern genotypes assert that the source of the ultimate source of variation in species of a given population is mutation. This means the combination of a certain species might change with changes in environment and immigration of genes.
Overly, the natural selection theory by Darwin is filled with some weakness. For instance, he did not explain the sources of species variation in a population. However, modern genotypes have asserted that mutation is the source of gene variation. Therefore, the probable consequences of evolution are the continued development of species that differ with the genes with humans. This is already visible especially with bacterias, germ and other disease-causing organisms, which have continued to mutate.
Reference
West-Eberhard, M. J. (2003). Developmental plasticity and evolution. Oxford University Press.