Explanation:

All four of the potential effects of genetic engineering have been experimentally achieved with varying degrees of success:

Enhancing Disease Resistance: There have been successful cases in both plants and animals where genetic engineering has been used to enhance resistance to diseases.

Promoting Accelerated Growth: Genetic engineering has been employed to promote faster growth, particularly in agricultural and aquaculture contexts.

Inducing Sterility: Genetic engineering techniques have been used to induce sterility in certain organisms, often for controlling pest populations or in the context of GMO crops.

Extending Longevity: There have been experimental approaches in genetic engineering aimed at extending the lifespan or longevity of organisms, although this area is still in the early stages of research.

Thus, all the listed effects have been achieved to some extent through genetic engineering.