Evolutionary theory is the framework tying together all of biology. It explains similarities and differences between organisms, fossils, biogeography, drug resistance, extreme features such as the peacock's tail, relative virulence of parasites, and much more besides. Without the theory of evolution, it would still be possible to know much about biology, but not to understand it.
This explanatory framework is useful in a practical sense. First, a unified theory is easier to learn, because the facts connect together rather than being so many isolated bits of trivia. Second, having a theory makes it possible to see gaps in the theory, suggesting productive areas for new research.
Evolutionary theory has been put to practical use in several areas
Bioinformatics, a multi-billion-dollar industry, consists largely of the comparison of genetic sequences. Descent with modification is one of its most basic assumptions.
Diseases and pests evolve resistance to the drugs and pesticides we use against them. Evolutionary theory is used in the field of resistance management in both medicine and agriculture
Evolutionary theory is used to manage fisheries for greater yields
Artificial selection has been used since prehistory, but it has become much more efficient with the addition of quantitative trait locus mapping.
Knowledge of the evolution of parasite virulence in human populations can help guide public health policy.
Sex allocation theory, based on evolution theory, was used to predict conditions under which the highly endangered kakapo bird would produce more female offspring, which retrieved it from the brink of extinction.
Evolutionary theory is being applied to and has potential applications in may other areas, from evaluating the threats of genetically modified crops to human psychology. Additional applications are sure to come.
Phylogenetic analysis, which uses the evolutionary principle of common descent, has proven its usefulness:
Tracing genes of known function and comparing how they are related to unknown genes helps one to predict unknown gene function, which is foundational for drug discovery.
Phylogenetic analysis is a standard part of epidemiology, since it allows the identification of disease reservoirs and sometimes the tracking of step-by-step transmission of disease. For example, phylogenetic analysis confirmed that a Florida dentist was infecting his patients with HIV, that HIV-1 and HIV-2 were transmitted to humans from chimpanzees and mangabey monkeys in the twentieth century, and, when polio was being eradicated from the Americas, that new cases were not coming from hidden reservoirs.
Phylogenetic analysis to track the diversity of a pathogen can be used to select an appropriate vaccine for a particular region
Ribotyping is a technique for identifying an organism or at least finding its closest known relative by mapping its ribosomal RNA onto the tree of life. It can be used even when the organisms cannot be cultured or recognized by other methods. Ribotyping and other genotyping methods have been used to find previously unknown infectious agents of human disease
Directed evolution allows the "breeding" of molecules or molecular pathways to create or enhance products, including:
enzymes,pigments,flavors,biopolymers,ba... strains to decompose hazardous materials.
Directed evolution can also be used to study the folding and function of natural enzymes.
Anti-evolutionary ideas have been around for millennia and have not yet contributed anything with any practical application.... The failure some few theist to grasp Science or a working theory of Biology just proof no gods are involved in the brain making industry...