Name the sources and the types of cry genes isolate from it for incorporation into crops by biotechnologists. Explain hoe these genes have brought beneficial changes in the genetically modified crops.
These genes encode a proteins that acts a toxin to kill certain insects such as lepidopterans (armyworm), coleopterans (beetles), and dipterans (flies/ mosquitoes). These genes produce a protein crystal containing a toxic protein (inactivated state). The inactivated toxin is activated in the gut of insect that by alkaline pH.
Inactivated toxinActivated toxin (gut of insect)
Activated toxin binds to the epithelial cells in the midgut of insect and creates pores that cause lyses and swelling and eventually death of insect.