A third gene source that alters potatoes comes from the greater Wax-moth. This alteration increases the potatoes resistance to bruising damage that occurs before people eat them. Other non-related genes that are transferred to potatoes come from the Giant Silk moth and a virus, which again provide potatoes with an increased resistance to diseases. Corn is another genetically altered crop. It does not have as many new genes transferred into it as potatoes do.
Corn receives a new gene from wheat, which helps reduce insect damage.
It also gets a gene from the Firefly, which gave rise to the introduction of marker genes. Finally corn contains a gene from bacteria that increases habitat tolerance. Tomatoes are another crop that carry genetically altered genes. The Flounder gene, for example, reduces damage to this crop by increasing the tomatoes to freezing. Another gene that affects tomatoes comes from a virus that encourages resistance to disease.