You may have learned about the sheep clone Dolly in your science class. Although this experiment was greeted as a great success,
there are many problems with cloning. One of the ethical issues surrounding cloning has to do with population genetics. The potential problem is that A) cloning is safer than traditional reproduction. B) cloning has become too successful in recent years. C) cloning is less safe than traditional reproduction. D) cloning could lead to a reduction of genetic variation.
Because it starts with "although", you realize there is a negative point coming in the second part of the sentence, which leads us to C and D. However, D is the one which is correct, because, in fact the genetic variation is diminished by the process of cloning. The new living organism created is a copy of some other. This way, it has the same DNA. If it the were a traditional case of reproduction, the new living organism would have a different DNA code, which leads us to answer D.
