D. All of the above are true.
Answer:
I believe it's d... or b
Explanation:
So I'm pretty confident that it's D seeing how it substitutes or deletes but it's only ONE gene...
LIt will increase steadily over time
Um i think the definition for back-grounding is an intermediate stage sometimes used in cattle production which begins after weaning and ends upon placement in a feedlot. I think i am correct i am 84% sure. Mark brainiest if this helped.
Have a nice day or night