Tomato Growing Center

Tomato Genetics

Pollination Methods: Solanum (Part 1)


Pleeeeeeeeeeeeeeeeeeeeeez Help w / this question confused !!!!!!!?

I learn genetics (boxes) in biology and I took trapped in this problem! * In tomato, the dominant color is red fruit, R, yellow fruit color, r. A farmer needs to produce red tomatoes tomatoes or yellow. He signed a contract with a major seed company providing pure red, RR, and pure yellow seeds, RR. They do not want hybrids. How can the farmer See if your tomatoes are pure red or hybrid? "Can you please answer expain!, Thank you sooo much!

the farmer would have a mixed system to see if the plants are purebred or not:) I hope that helped

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Genetically modified organisms, Kenya

A genetically modified organism (GMO) or genetically amended (GEO) is an organization whose material has been altered gene using genetic engineering techniques. These techniques generally known as recombinant DNA technology, DNA molecules use from different sources, which are combined in one molecule to create a new set of genes. This DNA is transferred into an organism, providing new or modified genes. Transgenic organisms, a subset of GMOs are organizations that have included DNA from a different species. Some GMOs do not contain DNA from other species and therefore non-transgenic, but cisgenic.

What foods are genetically modified?

The term GM food or GMOs (genetically modified organisms) is most often used to refer to crop plants created for human consumption or animal using the latest techniques of molecular biology. These plants have been modified in the laboratory to enhance desired characteristics such as resistance to herbicides or improved nutritional content. The improvement of desired traits has always been done by livestock, but conventional plant breeding methods can be very slow and often not very accurate. Genetic engineering, however, may create plants with the exact property you want very quickly and accurately. For example, geneticists can isolate a gene responsible for tolerance to drought and the insertion of the gene to another floor. The new GM plant tolerance to drought and gain. Not only may be transferred genes from one plant to another, but genes from non-plant can also be used. The best known example is the use of Bt genes in corn and other crops. Bt, Bacillus thuringiensis, a naturally occurring bacterium that produces proteins crystal are lethal to insect larvae. Bt crystal proteins have been transferred into corn, which allows the corn to produce its own pesticides against insects such as European corn borer.

What are some benefits of genetically modified foods?

The World population passed 6 billion people and expected to double over the next 50 years. Ensuring an adequate food supply for this population growing will be a great challenge in the years to come. GM foods promise to meet this need in a number of ways:

 pest resistance: loss of crops by pests can be enormous, resulting in devastating financial losses for farmers and hunger in developing countries. Farmers often use tons of chemical pesticides each year. Consumers do not want not eat food that has been treated with pesticides because of potential health hazards and runoff from agricultural waste from overuse Pesticides and fertilizers can poison the water and harm the environment. Growing genetically modified foods like corn Bt can help eliminate the use of chemical pesticides and reduce the costs of marketing a crop.

 Tolerance Herbicides: For some crops is not cost effective to remove weeds by physical means such as tilling, so farmers often spray large quantities of different herbicides (herbicide) to kill weeds, a long and costly process that requires care so that the herbicide not detrimental to the crop or the environment. Crop plants genetically modified to be resistant to a herbicide very power could help to prevent damage to the environment by reducing the amount of herbicides needed. For example, Monsanto has created a strain of genetically modified soybeans, not to be affected by its Roundup product. A farmer grows these soybeans which then only need one herbicide application instead of multiple applications, reducing production costs and limit the dangers of runoff of agricultural wastes.

 Disease resistance: There are many viruses, fungi and bacteria that cause plant diseases. plant biologists are working to create plants with resistance to disease genetic engineering.

 Cold Tolerance: unexpected frost can destroy sensitive plants. A antifreeze gene from cold water fish has been introduced into plants like tobacco, snuff and potatoes. With this antifreeze gene, these plants can tolerate very low temperatures that normally kill the unmodified plants.

 tolerance drought tolerance salinity /: As the world population increases and more land is used for housing production instead of food, farmers will grow in areas previously unsuitable for growing plants. The creation of plants that can withstand long periods of drought or high salt content in soil and groundwater help people grow in inhospitable places before.

 Nutrition: Malnutrition is common in third world countries where poor people have on a single crop, like rice for the main staple of their diet. However, rice does not contain sufficient quantities of all nutrients to prevent malnutrition. If rice could be genetically modified to contain the vitamins and minerals, deficiencies of elements nutrients may be reduced. For example, blindness due to vitamin A deficiency is a common problem in third world countries. Researchers at Swiss Federal Institute of Technology Institute of Plant Sciences, have created a strain of golden "rice containing an unusually high content beta-carotene into vitamin (A). Since this rice was funded by the Rockefeller Foundation, a nonprofit organization, the Institute hopes to providing rice seeds free of gold third world demand. Plans are underway to develop Golden Rice, which also increased the iron content. However, the grant funds to the creation of these two varieties of rice has not been renewed, perhaps because of the fierce struggle cons of GM food protesters in Europe, if the rice with enhanced nutritional value can not reach the market at all.

 Pharmaceutical products: Medicines and vaccines often are costly to produce and sometimes require special storage conditions are not readily available in the Third World. Researchers are working to develop edible vaccines in tomatoes and potatoes. These vaccines will be much easier to send, store and administer traditional injectable vaccines.

 Phytoremediation: All GM crops are grown commercially. Contamination soil and groundwater remains a problem throughout the world. Plants such as poplar trees have been genetically modified to eliminate pollution heavy metal contaminated soils.

What are some of the criticism against genetically modified foods?

Environmental campaigners, religious organizations, public interest groups, professional associations and other scientists and government officials have raised concerns about genetically modified foods, and criticized agribusiness for making profits without worrying about possible dangers. It seems that the whole world has a strong opinion about GM foods. Even the Vatican and the Mystery of the Prince of Wales have expressed their views. More concerns about GM foods fall into three categories: environmental hazards, risks to human health, and economic concerns.

Environmental hazards

 intentional damage to other organisms: last year a laboratory study showed that pollen from Bt corn caused high mortality rates in larvae of the monarch butterfly. Monarch caterpillars consume milkweed plants, not corn but the fear is that if pollen from Bt corn is blown by the wind plants in neighboring fields milkweed, caterpillars could eat the pollen and perish. Despite the study of nature has not been done in field conditions, the results seem to confirm this view. Unfortunately Bt toxins kill the larvae of many species of insects indiscriminately, it is not possible to design the Bt toxin only kills pests, and damaging to be safe for all other insects. This study is currently being reviewed by the USDA, U.S. Agency Environmental Protection Agency (EPA) groups and other non-governmental research and preliminary data from recent studies suggest that the initial study could be defective. It is hotly debated, and both sides of the argument are defending their data vigorously. At present there is no agreement on the results of these studies and the potential risk of harm to non-target organisms must be evaluated.

 Reduced effectiveness of pesticides: Just as some populations of mosquitoes develop resistance the pesticide DDT, now banned, many people fear that insects become resistant to Bt or other crops that have been genetically modified to produce their own pesticides.

 Gene transfer to non-target species: Another concern is that plants plants transgenic herbicide tolerance against weeds and mestizo, involving the transfer of genes for herbicide resistance in weeds cultures. These super weeds "that are then also herbicide tolerant. Other introduced genes may cross cultures non-GM crops planted transgenics. The possibility of crossing is indicated by the defense of farmers against lawsuits filed by Monsanto. Company sued for patent infringement against farmers who have harvested GM crops. Monsanto says farmers get Monsanto's transgenic seeds under license from an unknown source and did not pay royalties to Monsanto. The farmers say their crops not were amended cross-pollination of GM crops planted someone in a field or two away. Further research is needed to solve this problem.

 There are several possible solutions to the three problems mentioned above. Genes are exchanged between plants through pollen. Two ways to ensure that non-target species do not receive introduced genes from GM crops are modified to create plants are genetically male sterile (do not produce pollen) or to change the GM plant so that the pollen does not contain the introduced gene. Cross-pollination would not occur, and if harmless insects such as monarch caterpillars have been eating pollen from genetically modified plants, larvae could survive.
 Another possible solution is to create buffer zones around fields of GM crops. For example, non-GM corn would be planted to surround a field of genetically modified Bt maize and non-GM corn are not harvested. Beneficial or harmless insects would have a refuge non-GM maize, and insect pests can be allowed to destroy the non-GM maize did not develop resistance to Bt gene transfer of pesticides on weeds and other crops not occur because the pollen by the wind is not travel beyond the buffer zone. Estimates of the width of the zones necessary buffer range of 6-30 meters or more. This planting method may not be possible if the area is too necessary for the buffer zones.

Risks to human health

 allergenicity: Many children in the United States and Europe have developed allergies potentially deadly peanut and other foods. It is possible that the introduction of a gene into a plant may create a new allergen or cause a reaction allergic susceptible individuals. A proposal to incorporate a gene from Brazil nuts into soybeans was abandoned because of fear of causing unexpected allergic reactions. Extensive testing of GM foods may be necessary to avoid the possibility of effects harmful to consumers suffering from food allergies. The labeling of GM foods and food products will acquire new importance.

 unknown effects on human health: It is feared that the introduction of foreign genes into food plants can have unexpected and negative effects on human health. A recent article published in The Lancet examined the effects of GM potatoes in the digestive tract rats. This study argues that there are significant differences in the intestines of rats fed potatoes genetically modified and unmodified rats fed potatoes. But critics say the paper, as the monarch butterfly data, is flawed and can not withstand scientific scrutiny. In Furthermore, the gene introduced into the potatoes was a snowdrop flower lectin, a substance known to be toxic to mammals. Scientists who created this variety of potato has chosen to use the lectin gene simply test the methodology, and these potatoes are not intended for human consumption or animal feed.

 Overall, with the exception of possible allergenicity, scientists believe that GM food presents no risk to human health.

Economic concerns

 Take a food genetically changed on the market is a costly and lengthy process, and of course the agricultural biotechnology companies will ensure a return on their investment. Many new plant genetic engineering technology and GM plants have been patented, and patent infringement is a major concern of industry food. However, consumer advocates are concerned that patents These new varieties of plants increases the price of seeds so high that small farmers and third world countries will not be able to afford seeds for GM crops, thus widening the gap between rich and poor. It is hoped that a humanitarian gesture, more companies in nonprofit organizations will follow the example of the Rockefeller Foundation and offer their products at a reduced cost for poor countries.

 patent application can also be difficult, as the assertion that farmers have grown unintentionally Monsanto engineered strains when their crops cross-pollinating shown. One way to fight against patent infringement it is possible to introduce a suicide gene "into GM plants. These plants would be viable for a single growing season and produce sterile seeds that do not germinate. The farmers must buy a new supply of seeds each year. However, it would be economically disastrous for farmers in third world countries who can not afford to buy seeds every year and traditionally part of their harvest to plant the seed for next season. In an open letter to the public Monsanto is committed to abandon all research using this suicide gene technology.

Conclusion

Genetically changed have the potential to solve many problems of hunger and malnutrition, and to help protect and preserve the environment by increasing performance and reducing dependence on pesticides and herbicides. However, there are many challenges for governments, especially in the areas of safety testing, regulation, international policy and food labeling. Many people believe that genetic engineering is inevitable wave of the future and we can not afford to ignore a technology that has huge potential benefits. However, we must proceed carefully to avoid causing unintended harm to human health and the environment following our enthusiasm for this powerful technology.

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