BIOLOGY 3 Lecture Notes - Lecture 10: Agrobacterium Tumefaciens, Genetically Modified Food, Ti Plasmid
Document Summary
Some genetic modifications involve moving genes between organisms in labs. Crop plants are genetically modified to increase their shelf life, yield, and nutritive value: ex. Tomatoes engineered to soften and ripen more slowly; longer ripening time means stay on the vine longer, thus taste better; increase the amount of time that tomatoes can be left on grocery store shelves. Increase crop yields when plants are manipulated to be resistant to pesticides, herbicides, drought, and freezing. Modifying crop plants with the ti plasmid and gene gun. To modify crop plants, gene must be able to gain access to plant cell, must be able to move through plant"s rigid outer cell wall. Ferry for moving genes into flowering plants is naturally occurring plasmid of the bacterium agrobacterium tumefaciens infects plants and causes tumors called galls . Genes from different organisms inserted into ti plasmid by using same restriction enzyme to cut ti plasmid and the gene resulting identical sticky ends.
