Cloning in the field of medicine could have practical applications. For example, genes from humans that produce necessary proteins could be included in the animal DNA so that the animal would produce that protein in its milk or blood. That protein could then be extracted and used in treatment for various human diseases or disorders. This could lead to the prevention and/or cure for AIDS and cancer. Genetic defects could also be cured with cloning technology. A genetic defect is a mutation in which the DNA has been altered and caused an abnormality in the body. People who wish to have a child could be tested for possible mutations in the DNA, and a genetic solution could be created and injected into the still developing egg. Mutations' are natural, but when an abnormality occurs it's a hard thing for a person to live with. Through cloning technology, genetic defects could be treated enabling the person affected the possibility of longer life. When transplants are needed, it could give physicians the ability to create body parts through DNA. For example, a kidney can be grown outside the body using the patients' own DNA and used in a transplant without the fear of rejection.
Although correcting genes and creating body parts is good, I think it would be harmful for a human to be cloned. For instance, a child that is born from a cloned embryo would have a picture taken of him/her, along with a description of the child and placed in a sales catalog.