What is variation in living things? What is the variation of living beings?

Chromosomal variation, genetic variation, and in general, changes in biological expression caused by mutations in genetic material.

To put it simply, the difference in traits between the upper and lower generations of an organism is called heredity, and the difference in traits between the unsimilar part and the offspring is called variation.

Genetic mutations, genetic recombination, and chromosomal variations.

The mutation of organisms provides the raw materials for the evolution of organisms from simple to complex, from low to high, and provides the raw materials for the emergence of new types of organisms. Ways to use variation: 1

selecting, nurturing nature's favourable variation; 2.Obtain new varieties by means of hybridization; 3.Mutagenesis is used to breed new varieties.

There are two ways for organisms to reproduce.

Heredity and variation. As a simple example, an orangutan mother gives birth to a baby orangutan, which is genetic, but if a baby monkey is born, this is a mutation!

Variation in organisms refers to the phenomenon of differences between parents and offspring of organisms and between individuals of offspring, including both favorable and unfavorable variations.

Variation in organisms can be divided into two types: heritable variation and non-heritable variation, with the former being variation caused by changes in genetic material. The latter is only a variation caused by environmental factors, and its genetic material has not changed, and the variation of organisms commonly referred to refers to heritable variation.

Variation is not directive.

The theory of natural selection believes that the vast majority of organisms have a tendency to over-reproduce, that is, organisms can produce a large number of offspring, but the offspring can survive a small number of individuals, the reason for this mass reproduction, a small amount of survival: in nature, the food and space that organisms rely on to survive are very limited, and any creature must fight for enough food and space to survive.

The struggle for survival includes the struggle between individuals of the same species and individuals of different species, as well as biological and natural conditions, in the struggle for survival, individuals with favorable variation are easy to survive and reproduce, and at the same time pass on the favorable variation to the next generation, while individuals with adverse variation are easy to be eliminated, mutation is not directional, while natural selection is directional, determining the direction of biological evolution.

However, individuals in one species can mate freely with each other and produce normal fertile offspring. Species are not only the basic unit of taxonomy but also the unit of biological evolution. Through variation, genetics, and natural selection, one species can develop into a new species.

Genetic diversity refers to the genetic diversity that exists within living individuals, within individual species, and between species. The genetic makeup of a species determines its characteristics, including its adaptability to a particular environment and its availability to humans. Any given individual and species maintains a large number of genetic types, and in this sense, they can be seen as separate gene pools.

Genetic diversity, including genetic variability at the molecular, cellular, and individual levels, is therefore the basis for the evolution of life and the differentiation of species. The richer the genetic variation of a species, the stronger its ability to adapt to its living environment. And the more adaptable a species is, the greater its evolutionary potential.

Species diversity refers to the richness of flora, fauna and microbial species, which is the basis for human survival and development. Species resources provide the necessary living materials for human beings, especially in medicine, and the medical value of many wild biological species is of great significance to human health. With the development of medical science, the medicinal value of many species that are currently unknown to humans will continue to be discovered.

Ecosystem diversity refers to the variety of ecosystem types. There are many different types of ecology on Earth, but all ecosystems maintain their own ecological processes, including the cycle of chemical elements necessary for life and the maintenance of energy flows between ecosystem components. These ecological processes are essential for the survival, evolution and sustainability of all living things, both in a small ecosystem and on a global scale.

Maintaining ecosystem diversity is also essential for maintaining species and genetic diversity.

Species variation refers to changes in the genes of a species that are not the same as the original genes.