You see, there may be more than one direction of a force acting on an object so if both forces are of equal strength, the object doesn't move, but if one force is stronger than the other, the resultant force would tilt towards that force and the object would move that direction. It is the resultant force that decides where the object would go based on the forces acting on it.
The answer is cloning. Genetic engineering and gene manipulation will both change the gene of the organism. And artificial selection is to choose the desired one type from a population.
