Final answer:
The insertion of extra genetic material into an intron can lead to a nonfunctional protein by disrupting the normal splicing process.
Step-by-step explanation:
The insertion of extra genetic material into an intron can lead to a nonfunctional protein by disrupting the normal splicing process. Introns are non-coding regions of DNA that are typically removed during the process of gene expression. When extra genetic material is inserted into an intron, it can interfere with the ability of the gene to be properly transcribed and translated, resulting in a nonfunctional protein.