Which increases genetic variation?

Mutation.

Explanation:

The mutation increase genetic variation.

This mutation can be natural or artificial means man made. In genetic engineering, recombinant DNA technology also used to do mutation. The only mutation can bring significant changes in any organism.

All other processes of genetic variation do not carry as much as variation like mutation.

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.