Step 1: Understanding cry gene.
The cry gene is a gene found in certain strains of the bacterium Bacillus thuringiensis. This gene codes for a protein (Cry protein) that is toxic to certain insects. The gene is widely used in biotechnology to develop genetically modified crops that are resistant to pests.
Step 2: Conclusion.
The cry gene plays a vital role in producing insect-resistant crops by producing a toxin harmful to specific pests.
Match sequencing methods with key feature. 
Match the technique with its application. 