superiority
1, shortening the plant growth cycle;
2. Keep the excellent characters of crops and add some new advantages;
3. Increase crop yield.
disadvantaged
Many people have sexual reproduction and are prone to death due to bacterial invasion.
First, the division of labor of reproduction.
Schizogenesis, also known as schizogenesis, is a reproductive mode in which organisms split from their mothers into new offspring. The new individuals produced by division and reproduction are roughly the same in size and shape. In single-celled organisms, this mode of reproduction is more common. For example, paramecium, amoeba, euglena and bacteria all divide and reproduce.
Second, germination and reproduction.
Bud propagation, also called bud propagation, is a kind of propagation method in which the mother gives birth to buds in a certain part. The bud gradually grows up, forms the same individual as the mother, falls off from the mother and becomes a complete new individual. Yeast and hydra (when the environment is bad, hydra also has sexual reproduction. ) often bud and reproduce.
Spore reproduction (including asexual spores only)
Some creatures, when their bodies grow up, can produce a kind of cell, which can directly form a new individual without going through two two combination. This cell is called spore, and this reproduction is called spore reproduction.
For example, Rhizopus forms sporangia at the top of its upright mycelium, producing spores. Spores can develop into new rhizopus when they fall in a humid and warm environment rich in organic matter. Generally speaking, lower plants and fungi reproduce in this way. Such as Adiantum, Penicillium and Aspergillus.
Fourth, vegetative reproduction.
The reproductive mode in which vegetative organs (roots, leaves and stems) of plants produce new individuals is called vegetative reproduction. For example, the tubers of potatoes, the roots of thistles, the creeping branches of strawberries and the leaves of begonia can all germinate, and these buds can form new individuals.
Verb (abbreviation of verb) tissue culture
Plant cells are omnipotent. According to this theory, plant propagation can be completed by using plant tissue culture technology. The general process of plant tissue culture is as follows: under aseptic conditions, plant organs, tissues and cells are cut off and cultured in an appropriate artificial medium, and these organs or tissues will undergo cell division and form new tissues.
However, this tissue has not undergone cell differentiation. Under the action of proper light, temperature, some nutrients and plant hormones, these cells begin to differentiate, produce tissues and organs, and then develop into complete plants.
Six, cloning (Clone)
A group of cells or individuals with the same genetic structure formed by asexual reproduction of precursors. For gene cloning, it refers to multiple copies of a gene after repeated amplification.
Baidu encyclopedia-asexual reproduction