Evolution - is a biological factor.It applies to all changes in the system of living organisms, which occurred during the lifetime of our planet.All manifestations of the evolution taking place under the influence of certain factors.Which ones have the most impact, and how does it manifest itself?The main factors of evolution.
1. One is heredity.It is the ability to copy from generation to generation of some of the properties of the body that affect metabolism or other features of individual development as a whole.This factor guiding the evolution of self-reproduction is carried out by units of the genes that build up in the structure of the cell nucleus, namely in the chromosomes and cytoplasm.These genes are crucial in ensuring the continuity and diversity of species of different life forms.Heredity is considered the main factor, which is the foundation of the evolution of the whole of nature.
2. Variation in contrast to the first factor, it is a manifestation of living organisms different characteristics and properties that are independent of kinship.This property is characteristic of all animals.It is divided into the following categories: the hereditary and non-hereditary, group and individual, directed and undirected, qualitative and quantitative.Genetic variation is the result of mutations and non-hereditary - the influence of the external environment.Factors of evolution, heredity and variation can be called decisive in this process.
3. The struggle for existence.It defines the relationship between living organisms and their impact on the abiotic features.In this process, the organisms that are weaker die.There remain those who have higher viability.
4. Natural selection.It is a consequence of the previous factor.This process, in which the survival of the fittest individuals.SUMMARY natural selection is to convert populations.As a result, there are new kinds of living organisms.It can be called one of the engines of evolution.How many other factors of evolution, it was opened by Charles Darwin.
5. devices.These include the structural features of the body color, manners, methods of education of offspring and more.These factors very much, so they are not yet fully understood.
6. Population wave.The essence of this factor is some hesitation numbers of certain species of living organisms.As a result of a rare species may become more numerous, and vice versa.
7. Isolation.It implies the emergence of barriers to the spread of living organisms and their crosses.For its appearance may be different reasons: mechanical, environmental, territorial, morphological, genetic, and so on. D. One of the main reasons for the increase is often the difference between close earlier organisms.
8. Mutations.These environmental factors may arise by natural or man-made features.When making changes to the genetic nature of the organism occurring mutational changes.This factor is the basis of genetic changes.
9. Gene flow.There are situations where the population size is sharply reduced.This may be due to various circumstances (flood, fire).The remaining representatives of living organisms are the determining element in the formation of new populations.As a result, it may disappear some symptoms of this kind and be new.
Human development went their way.But the evolution of human factors similar to those described above.
