I do believe that it is C. crossing over :) I hope that is correct, it seems like the only plausible answer.
The rungs are composed of hydrogen bonded paired Nitrogenous Bases. These pairings are Adenine to Thymine and Guanine to Cytosine.
Genetic engineering is the process of using recombinant DNA (rDNA) technology to alter the genetic makeup of an organism.
