Human clones was made during Mahabharata.

Scientific approach:

Clones are organisms that are exact genetic copies. Every single bit of their DNA is identical.

Clones can happen naturally—identical twins are just one of many examples. Or they can be made in the lab. Below, find out how natural identical twins are similar to and different from clones made through modern cloning technologies. There are two ways to make an exact genetic copy of an organism in a lab: artificial embryo twinning and somatic cell nuclear transfer.

Dolly  born on 5 July 1996 was a female domestic sheep, and the first mammal cloned from an adult somatic cell, using the process of nuclear transfer.

 Religious Understanding:

According to Mahabharata, Once Sage Vyasa came to visit Gandhari in Hastinapur. She took great care of the comforts of the great saint and saw that he had a pleasant stay in Hastinapur. The saint was pleased with Gandhari and granted her a boon. Gandhari wished for one hundred sons who would be as powerful as her husband. Vyasa granted her the boon and in due course of time Gandhari found herself to be pregnant. But two years passed and still the baby was not born. Meanwhile, Kunti received a son from god Yama whom she called Yudhishthira. After two years of pregnancy, Gandhari gave birth to a hard piece of lifeless flesh that was not a baby at all. Gandhari was devastated as she had expected a hundred sons according to the blessing of Rishi Vyas. She was about to throw away the piece of flesh when Rishi Vyas appeared and told her that his blessings could not have been in vain and asked Gandhari to arrange for one hundred jars to be filled with Ghee(oil). He told Gandhari that he would cut the piece of flesh into hundred pieces and place them in the jars, which would then develop into the one hundred sons that she so desired. Gandhari told Vyas then that she also wanted to have a daughter. Vyas agreed and cut the piece of flesh into one hundred and one pieces and placed them each in the jars. After two more years of patient waiting the jars were ready to be opened.

When the first jar was opened the first baby was born ,he was Duryodhana.

If we observe this phenomenon closely, we get it similar with artificial embryo twinning, not limited to only two organism and jar filled with ghee representing test tubes where babies are kept safe.