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And now, Britain is on the brink of becoming the first nation in the world that permits creation of children with the DNA of two genetic mothers and a father.

A very complex technique of IVF can be used, with modification of the embryo's mitochondria, or the tiny power cells, "engine rooms" of the human body, according to The Daily Mail.

Researchers at Newcastle University have created a new method to exchange a mother-to-be's diseased mitochondria with a healthy one from an egg donated by another mother. Hence, this can help to avert risks of inheriting genetic conditions from the mother.

This technique can help almost 2,500 families a year.

Conservatives have slammed this technique, calling the three-parent plan unethical, as the baby will inherit the DNA of three people, explains Christian Today.

Some have criticised the ethics and the "playing God" role of the parents, while a few point out that the procedure is not as safe as it appears.

Still, the law has now been passed. It is legal to adopt this technique, and the first attempt will most probably be made by the end of this year.