Reproduction is biology what is it? Definition and examples of reproduction in nature
Reproduction is a concept in biology thatis associated with such processes as fertilization, division and direct reproduction, the reproduction of their own kind. This concept is also used in painting, but the topic of the article of this aspect does not concern.
What is reproduction in biology: definition
Self-reproduction is one of the mostimportant concepts in biology. The process of creating oneself provides the further existence of species. Reproduction, or reproduction, is often considered solely from the point of view of producing offspring in animals and plants. This is one of the important signs of all living organisms. At the lowest level, this is called chemical replication.
Unicellular organisms have the ability of onecells to reproduction means the appearance of a new individual. In multicellular organisms, however, this means growth and regeneration. Reproduction occurs in a variety of ways, accompanied by a complex system of organs and the work of specific hormonal mechanisms.
Levels of reproduction
Reproduction is a concept in biology, which means reproduction and reproduction of similar ones. The following levels are distinguished:
- molecular copying;
- reproduction of cells;
- reproduction of organisms.
Let us dwell on the latter in more detail.
Sexual and asexual reproduction
Reproduction is in biology an integral part of the existence of all life on the planet. Multicellular organisms distinguish between the sexless and the sexual way of reproduction.
Vegetative reproduction can have a largea variety of forms. Many multicellular lower plants distinguish asexual spores, which can be either mononuclear or multinucleated. Often whole fragments of the vegetative part of the body can reproduce a new organism, which is found in most plants.
In many cases, asexual reproductionis carried out at the expense of roots and shoots. Sometimes other parts of plants have the ability to self-reproduce, for example, the kidneys. Asexual reproduction is also characteristic of some animals, including numerous species of invertebrates (sponges, hydras, worms). Vertebrates lost the ability to reproduce vegetatively, their only form of organ reproduction is the sexual way.
Reproduction and natural selection
The importance of biological reproduction canTo be explained solely through natural selection. In developing his theory, Charles Darwin concluded: in order to evolve, living organisms must be able not only to reproduce themselves, but also undergo certain changes. Thus, more successful generations will make a greater contribution to the subsequent development of the species of descendants. In addition, the magnitude of these changes and genetic transformations is particularly important. They should not be too little or too much.
Examples and methods of reproduction in nature
What does reproduction look like in biology? Examples, like the methods, are quite numerous. Sexual reproduction, which involves the combination of parental genes, is the way to get a new individual organism. During fertilization, the genomes of the spermatozoon and the ovum combine to form a zygote that, after numerous transformations, becomes an embryo. This type of reproduction is widespread in almost all groups of multicellular organisms. Pollination is quite interesting from a biological point of view.
Reproduction is in biology a sign thatis inherent in all living organisms. Reproduction ensures continuity and continuity of the entire life cycle. There are many ways of reproduction, but there are two main ones. This is sexual and asexual reproduction. Since all organisms have a cellular structure, then at the basis of all forms and methods of reproduction is cell division.