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Dolly’s creation triggered fears of human reproductive cloning, or producing genetic copies of living or dead people, but mainstream scientists have ruled this out as far too dangerous.

Although the UK allows the use of cloned human embryos for therapeutic purposes, it has banned reproductive cloning which would aim to create a new-born baby that is genetically identical to another human being.

This was in part because of the difficulty of achieving agreement about rules for reproductive cloning to create a child, versus therapeutic cloning to create biologically compatible tissue to treat an existing person10.

Moreover, the worldwide ban on human reproductive cloning would prevent such a test from being conducted on models formed from induced pluripotent stem cells.

Widespread concerns over the health effects and ethics of cloning led to a UN ban on human cloning in 2005; several countries have also banned reproductive cloning of animals.