Transgenic breeding and other methods can be used to breed new varieties, and the principle of this

It can also be called genetic engineering, and the principle is genetic recombination.

This is done by introducing artificially isolated and modified genes into the genome of an organism.

It is the introduction of artificially isolated and modified genes into the genome of an organism, and the expression of the introduced genes causes the heritable modification of the traits of the organism.

Summary. Transgenic methods cannot replace crossbreeding to produce new varieties. Conventional breeding is the artificial selection of natural species from different natural environmental conditions.

The most important feature of this selection is that it does not carry out artificial and mandatory isolation, mating and inducement of natural species, but selects by changing the surrounding environment. Those species that excel in a particular environment are selected to be retained, and those that do not perform well are eliminated. Therefore, the purpose of conventional breeding is to select new varieties with excellent traits under different natural conditions.

This new breed has a stable genetic trait that can continue to manifest itself in its entirety in future generations.

Whether transgenic methods can replace crossbreeding to produce new varieties and what is the relationship with conventional breeding.

It is the subject of forest tree genetics.

Transgenic methods cannot replace crossbreeding to produce new varieties. Conventional breeding is the artificial selection of natural species from different natural environmental conditions. The most important feature of this selection is that it is not subjected to the mandatory isolation, mating and induction of natural species, but by changing the surrounding environment.

Those species that excel in a particular environment are selected to be retained, and those that do not perform well are eliminated. Therefore, conventional breeding is to select new varieties with excellent traits under different natural conditions. This new variety has stable genetic characteristics that can be fully manifested in future generations.

Transgenic breeding is the process of artificially selecting a specific gene from the genetic material of a certain species, isolating it, and then inserting it into the genetic structure of another species with artificial, coercive means to change some of the expressive traits of the target species. Normally, it is not possible for this genetic material, or genes, to produce offspring through natural mating. In other words, transgenic is a human-controlled match of genetic material between species, not an automatic matching of natural genetic material in nature.

Therefore, genetically modified organisms are contrary to the laws of natural heredity. The biggest feature of transgenic breeding is that it is very specific, usually involving only one or two specific genes, such as BT and herbicide resistance genes. Its ultimate goal is also to obtain the characteristics of a special excellent spike lead, such as insect resistance.

A single transgenic species is stable, and its genetic material manifests itself in its entirety in the offspring. Another feature of transgenes is that, in addition to the target gene, it also brings promoters, terminators, and antibiotic screening markers to the recipient species. These are exogenous substances, not native species.

Variation is the universal law of erection in the biological world, and it is the main research content of the improvement of forest tree heritage through the study of forest tree genetics and field experiments, what is your opinion on the variation of forest trees.

Mutation is a common phenomenon in the biological world, and there is no law to follow! There are good and bad, there is uncertainty due to scum, and good variations are often retained by long-term natural selection in nature, which is the so-called natural selection, the survival of the fittest. Of course, it is also possible to mutate a plant through human intervention, through artificial selection!

So as to get the plants with the traits they need.

There are many ways to use the principle of genetic variation to breed new varieties, and humans use genetic recombination, gene mutation, chromosomal variation and other heritable variations to cultivate new biological varieties. Irradiation of wheat seeds with a certain dose of radioactive cobalt belongs to the process of using radiation to induce genetic mutations and produce heritable mutations, which belongs to mutagenesis breeding.

Therefore, the answer is: artificial breeding; cross-breeding; Mutagenesis breeding

Breeding technology mainly includes natural domestication, artificial breeding, artificial mutagenesis, hybrid breeding, molecular breeding, transgenic breeding, etc., the process of technology development is the process of continuously improving breeding efficiency, and the common thing is to obtain excellent traits through genetic changes.

In general, hybrid breeding technology can only achieve gene transfer on individuals within biological populations, while transgenic technology is not limited by the genetic relationship between organisms and breaks the barrier of natural hybridization between different species.

In layman's terms, hybridization can only be carried out on the same species of animals and plants, and good individuals are selected for breeding (e.g., horses and donkeys cross to give birth to mules), while transgenic can combine different species of things, such as plants that bear tomatoes on the top and potatoes on the bottom.

Hybrid breeding technology is generally carried out at the level of biological individuals, and the object of operation is the entire genome, which cannot accurately manipulate and select a certain gene, and the breeding cycle is long and the workload is large. The transgenic technology has clear goals and is more controllable, and the performance of future generations can be expected.

Hybridization can only find excellent individuals to breed, and genetically modified technology can be mixed with whatever you want, like a dog with a cat's head!!

Answer: Breeding technology copy

The techniques mainly include natural domestication, human baigongdu

The process of technological development is the process of continuously improving breeding efficiency, and the common feature is to obtain excellent traits through genetic changes.

Compared with traditional breeding technology, transgenic technology has the following two advantages: first, traditional technology can generally only achieve gene transfer in individuals within biological species, while transgenic technology is not limited by the genetic relationship between organisms, which can break the barrier of natural hybridization between different species and broaden the availability of genes; Second, the traditional technology is generally carried out at the level of biological individuals, the object of operation is the entire genome, it is impossible to accurately manipulate and select a certain gene, the breeding cycle is long, the workload is large, and the transgenic technology has clear goals and is more controllable, and the performance of offspring can be expected.

Around when did GMO breeding begin? As follows:

a.Year 1761.

b.1930 year.

c.1987 year.

d.1998 year.

Which of the above four options will you choose?

The correct answer is: c1987 year.

Genetically modified breeding (GMB) refers to the breeding method of adding one or more genes to an organism's genome through modern molecular biology techniques to produce organisms with improved characteristics.

The goal of GMB and conventional breeding is to produce organisms with improved traits by altering their genetic composition. GMB Tongyuan achieves this by adding one or more new genes to the genome of an organism. Conventional breeding achieves it by crossing organisms with relevant traits and selecting offspring with the desired combination of traits, or by inducing mutations.

Transgenic plant breeding is the fastest growing field of agricultural biotechnology application in the late 20th and early 21st centuries. Since the first transgenic breeding crop was launched in 1996, by 2017, the cumulative cultivation area of transgenic breeding crops in the world has reached 100 million hectares.

Including 100 million hectares of genetically modified soybeans, 100 million hectares of genetically modified corn, 100 million hectares of genetically modified cotton, and 100 million hectares of genetically modified rape. These genetically modified crops provide food, feed, fibre and fuel to 7.6 billion people around the world.

GM breeding began circa 1987.

1. The birth of genetically modified technology.

The term molecular biology was first used in 1945 to refer to the study of the chemical and physical structure of biological macromolecules.

Biology has gone through a long process of research, starting with the study of the morphology, anatomy, and classification of animals and plants, and then moving on to cytology, genetics, microbiology, physiology, biochemistry, and then to the cellular level. Arrive.

Since the middle of the 20th century, biology has taken biological macromolecules as the research goal, and molecular biology has begun to form an independent discipline.

Molecular biology is the study of the molecular basis of all biological phenomena.

Second, the development trend of genetically modified technology.

Gene technology is a high-tech technology with huge input and output, and has huge intellectual and economic value.

Gene technology is a high-tech technology with huge input and output, and has huge intellectual and economic value. From a certain one.

In a sense, gene technology represents a country's level of science and technology, and all countries in the world regard biotechnology, especially genetic research.

Identified as a key technology for economic and technological development in the 21st century The production of genetic foods that meet human needs has become more and more clear.

and operationalization.

The advantages of transgenic technology compared with traditional breeding techniques do not include:

Hello dear, compared with traditional breeding technology, the advantages of transgenic technology do not include the following:1Uncertainty about long-term effects:

GM technology is not yet fully understood about its potential impact on the environment and ecosystems, so uncertainty about its long-term effects is an important issue. Traditional breeding techniques are relatively more reliable in this regard because they are based on natural variation and selection, evolved and adapted over a long period of time. 2.

Risks to biodiversity: Genetically modified technologies may pose potential risks to biodiversity. As the genome of genetically modified crops is modified, they may have an undesirable impact on the population of other organisms, thus posing a threat to the balance and stability of the ecosystem.

3.Dependencies and patents: GMO technologies are often developed and controlled by large biotech companies, which can lead to increased dependence of farmers and agricultural systems on these companies.

In addition, the seeds of genetically modified crops are often protected by patents, and farmers need to buy new seeds and cannot use their own seeds for planting again. 4.Public Concern and Risk Perception:

Genetically modified technology has caused widespread controversy and concern among the public. Some are concerned about the potential risks to human health from genetically modified crops, as well as the impact on traditional agriculture and food systems. This perception of risk may lead to consumer resistance and rejection of GMO products.

In conclusion, although transgenic technology has advantages in increasing crop yields, improving disease resistance and adapting to the environment, it also has some potential problems and risks, which are the traditional breeding techniques.

Summary. Pro, because genetically modified breeding may cause serious ecological pollution, just like the "overlord flower", once a large area is reproduced, then the ecology is easily damaged and polluted.

Transgenic breeding and molecular marker breeding are both molecular breeding methods, why some people oppose transgenic breeding.

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Molecular Breeding - The application of molecular biology techniques to breeding, breeding at the level of molecular hosiery. It usually includes: molecular marker-assisted breeding and genetic modification breeding

Genetically modified breeding is a breeding method that applies genetic engineering to breeding work, and breeds new varieties that must be sought after through gene introduction.

Disadvantages of Residual Gene Breeding: The individuals produced by breeding may cause damage such as ecological pollution because of their strong adaptability. This is also a concern for many people at the moment, but it has not had a big impact in reality.

Pro, because genetically modified breeding can cause serious ecological pollution, just like "tyrant rents king flowers", once the laughing Qi destroys the area to reproduce, then the ecology is easy to be damaged and polluted.

The composition of the plant transgenic technique is not covered (plant species analysis).

Introduction to plant transgenic technology: the use of molecular biology means to clone the target gene, through biological or physicochemical methods to transfer the target gene into the gene group of other species, thereby adding new genes to the gene group of the species, this technology is called transgenic technology.

Organisms containing exogenous genes obtained by transgenic technology are called transgenic organisms. The food made and processed from transgenic organisms is called transgenic food.

Transgenic organisms mainly include transgenic plants, transgenic animals and transgenic microorganisms. At present, transgenic plants are widely used commercially at home and abroad. Many new plant varieties have been successfully cultivated by using transgenic technology, and have been popularized and applied in field production, and great economic and social benefits have been achieved.

The key to plant transgenic technology is to insert the target gene into the genome DNA of the recipient plant, so that it can replicate and inherit along with the plant's genome. At present, there are many useful target factors identified at home and abroad, such as improving the photosynthetic efficiency of rice, and some can improve the synthesis of vitamin A, drought resistance, salinity-alkali tolerance, and cold resistance.

Transgenic technologies can be divided into four main categories according to their transformation methods: Agrobacterium-mediated methods, direct DNA insertion methods, pollen tube channel methods, and plant disease-mediated methods.

Agrobacterium-mediated method refers to the transformation technology that uses Agrobacterium transformation receptors to refine Li Hong's excitation cells and insert target genes into the receptor cell gene group. At present, this method has been studied a lot, the mechanism is clear, and the application of plant transgenesis technology is widely and mature. Direct DNA insertion is a method that does not require the transformation of plasmid vectors to achieve the insertion of a foreign target gene.

This kind of method mainly includes: gene gun method, liposome method, polyethylene glycol method (PEG method) and other forms.

Pollen tube mediated method is to inject a solution containing target genes into the flower room of the plant after flowering and pollination, and the target gene enters the zygote through the pollen tube channel, and then integrates into the gene group of the zygote. This method has high transformation efficiency, easy operation, and is widely used in China because the transgenic plant traits are stable and fast. Plant disease mediation mainly inserts exogenous target genes into the disease, and uses this virus to transfect plants, so as to transfer foreign genes into plant cells.