Variations lead to Evolution

Variations

Organic evolution is the change in the characteristics of a population or species of organisms over the course of generations. The evolutionary changes are always inheritable. The changes in an individual are not consisted as evolution, because evolution refers to populations and not to individuals. Organic evolution includes two major processes:

·         Alteration in genetic characteristics of a type of organism over time; and

·         Creation of new types of organisms from single type.

The study of evolution determines the ancestry and relationships among different kinds of organisms. The anti-evolution ideas support that all living things had been created in their current form only a few thousand years ago. It is known as the “theory of special creation”. But the scientific work in eighteen century led to the idea that living things might change as well.

Charles Darwin (1809-1882) proposed the mechanism of organic evolution in 1838. It was called as “The theory of Natural selection”. Darwin proposed this theory after his 5-year voyage on the HMS (his majesty’s Ship) Beagle. He also published a book “on the origin of species by means of natural selection” in 1859.

Darwin’s theory of evolution was not widely accepted because of because of lack of sufficient evidence. Modern evolutionary theory began in the late 1920s and early1930s. Some scientists proved that the theory of natural selection and Mendelian genetics are the same ideas just as Darwin had proposed.