The best answer for this item is B. DNA fingerprinting refers to a molecular biology tool that allows the investigators to identify the individuals who are truly responsible for committing a crime by using the DNA evidence that is found in a crime scene. It prevents the law enforcers from making a wrongful conviction or mistakes during investigations.

B. DNA fingerprinting can be used to identify persons who were wrongly convicted of a crime.

The correct answer is D. The series of dark bands in DNA fingerprinting represent the DNA fragments that have various sizes or lengths.

D. DNA fragments of different lengths

The correct answer is B. The plant cells of genetically modified crops are often transformed using Agrobacterium which contains a resistance gene. This gives the GM crop plant resistance against insects, viral infections, and herbicides.

However, the concern for this action is that the pests and weeds came out stronger as they evolved. Therefore, farmers tend to use more herbicides or weed-killing compounds that disrupt the balance in the ecosystem and pollute the environment.

B. Farming with GM plants that are resistant to chemical herbicides may lead to overuse of weed-killing compounds.

The correct answer is A. A technique called CRISPR (Clustered regularly interspersed short palindromic repeats) allows the scientists to change the DNA base sequences of the genes found in eukaryotic cells. This tool can be used without the need for a DNA insertion from another source.

A. CRISPR

The correct answer is selective breeding. In selective breeding, the best trait of the chicken is chosen to be produced for the next generations. This would allow an increase in the frequency of the trait in the chickens.

D. selective breeding