However, Dolly and her mother are not identical in every way. Since Dolly and her “DNA mother” have different experiences, they are different in many ways. Like human twins, clones have unique personalities.

It took scientists 277 tries to succeed in cloning Dolly. To make her, Dr. Wilmut used a complicated method called “nuclear transfer.” In this method, scientists remove a nucleus from one cell and transfer, or move, it to a different cell.