Asexual reproduction occurs without the exchange of genetic information between two individuals of different sexes.It is characteristic of protozoa - amoebae, ciliates shoes.Variability they do not have, for thousands of years the individual subsidiaries fully replicate the parent.
One way of asexual reproduction - division when one particular way of two subsidiaries (eg amoeba).When it first begins to divide the core of the body, and then splits in half the cytoplasm.This method is common among bacteria.
simplest organism reproduces by budding hydra: children in a special way from the "mother" of the body.
Starfish multiplies fragmented way, "parent" body is divided into parts, each of them becomes a full-fledged new st
Another way - the reproduction of spores.We are talking about multicellular organisms - fungi and plants.When asexual reproduction in this process involves only a single plant.It forms spores or vegetative separates viable areas of the body, and are formed by individual subsidiaries under favorable circumstances.
Vegetative reproduction in plants occurs by means of vegetative organs - the leaves, roots and shoots modified.Violet, for example, reproduces leaves and raspberry roots.This phenomenon is particularly common among wild plants.Vegetative reproduction is natural and the artificial, when it is made by man.
Often in vivo certain species of plants propagated by the same bodies: tulips, lilies, daffodils, onions and garlic - bulbs;dahlias, Jerusalem artichokes, potatoes - tubers;strawberries - creeping shoots (mustache);willow-herb, Horsetail, Yarrow - rhizomes.
There are plants that can multiply and sexually and asexually (willow, aspen, raspberry), and there are those which are characterized by a vegetative means (eg, Canadian waterweed dioica).
Plus artificial vegetative propagation is that it allows you to save the genetic purity in breeding sincesubsidiary plant takes over all quality of the parent.A minus - in reducing resistance to diseases and pests, which occurs after a few years of asexual reproduction.
in agriculture and horticulture applied artificial ways of vegetative propagation by dividing the bush, layering, cuttings and vaccinations.