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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.
Explain Microorganisms Associated With The Raw Foods? Foods of animal and plant origin are in direct contact with air, soil and water and get contaminated with the microorganis
trinominal names
Starch gelatinization Undamaged starch granules are insoluble in cold water but can imbibe water reversibly i.e. they can swell slightly and then return to their original siz
Types of overpopulation - Consumption overpopulation Consumption overpopulation is a phenomenon seen in technologically advanced and affluent countries such as U.S.A., Japan,
which system give the signals to salivary gland
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Define Consistency and Texture - Dysphilgia? Aspiration of liquids, including water, into the lungs can result in complications. To avoid this problem and yet fulfilling the fl
Oleic - Linoleic Fats Fats in this group are the most abundant. The oils are all of vegetable origin and contain large amounts of oleic and linoleic acids, and less than 20%
Q. Is there respiratory pigment in the annelid blood? The blood in beings of the phylum Annelida contains the respiratory pigment hemoglobin the same found in chordates and oth
Terrestrial and Aquatic Ecosystem What is common between a terrestrial and an aquatic ecosystem. Both have similar type of trophic structure. They possess an autotrophic layer
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