Scientists can reproduce identical offspring from adult cells through a technique called somatic cell nuclear transfer (SCNT). SCNT involves transferring the nucleus from an adult cell into an egg that has had its nucleus removed. The egg is then fertilized, and the resulting embryo is implanted into a surrogate mother. If successful, the surrogate mother will give birth to an offspring that is genetically identical to the adult cell donor.

SCNT has been used to create animals such as Dolly the sheep and has the potential to be used for human reproduction. However, there are many ethical concerns associated with SCNT, and it remains a highly controversial topic.