Modern evolutionary theory is based on the foundation of genetics, to reveal the nature of the material of heredity. Evolving unit of such a position is not the individual and not the form, and the population, ie set of individuals of a species inhabiting a certain area for a long time and freely interbreed. The basis of genetic changes in the population lies mutational variability as a result of sudden mutations - genetic changes of the genetic apparatus. Mutations can occur in any cell at any stage of development, both in normal conditions of existence (spontaneous mutation), or under the influence of any physical or chemical factors (induced mutations). If you get more information, visit our site: BEST ESSAY CHEAP
