If a dyad fails to separate what percentage of gametes will have too many pieces of dna

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

helicase, i think thats it

i think the answer is a.keratin is the pigment responsible for skin color.