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Retroviral method: A retrovirus is a virus that carries its genetic material in the form of RNA rather than DNA. In this method retroviruses are used as vectors to transfer genetic material into the host cell, resulting in a chimera, an organism consisting of tissues or parts of diverse genetic constitution. Chimeras are inbred for as many as 20 generations until homozygous (carrying the desired transgene in every cell) transgenic offsprings are born. The method was successfully used in 1974 when a simian virus was inserted into mice embryos, resulting in mice carrying this DNA. In retroviral method, 8-cell stage embryo is removed and infected by virus carrying foreign gene. The retroviral is made defective in such a way that, it can effectively penetrate cells without replication. The transformed embryo is then implanted back in foster mother. After birth, the matings are carried out to establish transgenic line. Although retrovirus is a good choice as a vector, it can carry only a limited size of the foreign DNA.
how is biotechnology useful?
Which is the type of nitrogen waste eliminated by beings of the class Reptilia? These beings excrete mainly uric acid. This substance is less toxic than ammonia and it can be k
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Explain Zipping of the Apical Canal a. If the preparation is continued with progressively larger and stiffer file lead to : zipping perforation or tear apical foramen.
Q. List the tissues of pancreas? The pancreas is made up of two types of tissue: The exocrine tissue secretes digestive enzymes. These enzymes are secreted into a network of
Widal test is used for the diagnosis of: 1. Malaria 2. Pneumonia 3. Tuberculosis 4. Typhoid Typhoid
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Name the reserve food materials in pheophyceae Ans) Reserve food materials in pheophyceae are laminarin and mannitol
Define the Effect of niacin deficiency on Digestive Sysytem? The predominant symptoms are glossitis and diarrhoea. Glossitis, cheilosis and stomatitis may vary from mild rednes
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