Question 4
What can genetic engineering do that selective breeding cannot?
The right answer is the one marked above.
Move a gene from one species into a completely different one. Selective breeding can only rearrange the alleles a species already has. Genetic engineering crosses the boundary between species.
Improving yield, producing disease-resistant varieties and changing a species over time can all be done by ordinary breeding, given enough generations. Only moving a gene between species is out of its reach.