Final answer:
If the Left Border sequence was deleted from the pTi (Ti plasmid), it would result in a loss of its ability to transfer genes into plant cells and induce crown gall tumors.
Step-by-step explanation:
If the Left Border sequence was deleted from the pTi (Ti plasmid), it would not be able to transfer genetic material into plant cells efficiently. The Left Border sequence is important for the recognition and integration of the Ti plasmid into the plant genome. Without it, the plasmid would not be able to successfully transfer genes into the plant, leading to a loss of its ability to induce crown gall tumors or cause other transformations in the plant.