Are scientists creating a moral nightmare? The UK’s first baby with DNA from three people has been born in a bid to fight mitochondrial diseases. Some worry we are edging into an ethical grey area.
Britain’s first three-parent baby is born

Glossary
Defective - Not working.
Mitochondria - Small organs within nearly all types of human cell that generate much of the cell's energy. Often called the 'powerhouse of the cell'.
IVF - In vitro fertilisation is a technique used to help people with fertility issues have a baby.
Embryos - An unborn or unhatched offspring in the process of development.
Schizophrenia - A mental illness often accompanied by delusions and hallucinations. The term derives from two Greek words meaning "divided" and "mind".
Eugenics - The idea that human beings should be improved through genetic engineering. In the past, eugenics has generally involved killing people who are deemed “inferior”.