Genetic Engineering
GENETIC ENGINEERING OF COTTON FOR INSECT RESISTANCE The DNA code mostly contains instructions for protein synthesis. The code is read in groups of three nucleotides and each triplet of nucleotides codes for one of the twenty amino acids which link together in a polypeptide chain to form a protein. The code is universal, so the same code applies in nearly all living organisms. Some triplets have special functions and direct protein synthesis to start or stop. Protein synthesis occurs in ribosomes where a copy of the gene coding for a protein (mRNA) is translated to produce a protein. Some proteins may be consist of several polypeptide chains and the genes required to do this are collectively called a transcription unit. Fig. 2 Diagram showing how genes code for proteins Bacterium also contain small circular loops of DNA called plasmids which are not essential to the bacterium but can be useful in certain environmental conditions such as resistance to antibiotics. Because bacterium are prokaryotic and don’t have a nucleus plasmids are easy to obtain in pure form and can be introduced into other cells. Plasmids are also capable of independent self-replication, which makes them useful in multiplying useful DNA. Bacteria also produce
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Bt Toxin, DNA Bascillus, RESISTANCE DNA, DNA Bacteria, bt gene, cotton insect resistance, engineering cotton insect, cotton plant, insect resistance, protein synthesis, engineering cotton, cotton insect, genetically engineering cotton, resistance antibiotics, genetically engineering, restriction enzymes, plant cell, bt gene cotton, resistance antibiotics kanamycin,
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