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Paul Tully from the Society for the Protection of Unborn Children said the "three parent" IVF technique is a "step" towards designer babies.
Mr Tully told ITV News: "It is a change that can be passed on to future generations, and we are manipulating the genes of a child.
"We're concerned that we are replacing what we know to be defective DNA in the embryos that we don't like with what we think is good DNA - but we can't be sure.
"Putting the money into this kind of research is denying funding to research which is needed and ongoing to help people with mitochondrial diseases and other diseases in other ways.
"We've seen the same thing before with stem cell research, we've seen it with IVF - promises that using embryos will lead to advances but come to nothing.
Dr David King, director of Human Genetics Alert, told ITV News the "three parent" IVF technique crosses a "crucial ethical line":
Britain could become the first country in the world to allow babies to be born with three genetic parents to help stamp out serious diseases.
If MPs agree that the controversial technique is ethically acceptable the first babies could be born by the end of next year.
Some critics believe the move would mark a slippery slope leading to "designer babies". It's predicted that between five and 10 "three parent" babies could be born each year.
- If the new technique gets the go-ahead only a tiny amount of DNA in a cell will be changed
- The part that determines individual characteristics such as facial features and eye colour, will remain intact
- But the defective DNA will be replaced by a healthy version supplied by a female donor, making them the third genetic parent
The aim of this form of IVF is to stamp out serious diseases which can be passed from a mother to her children. Around one in 200 babies are born each year in the UK with a defect in the way cells are supplied with energy.
One in 6,500 babies can suffer potentially life-threatening diseases including a form of muscular dystrophy and conditions leading to hearing and vision loss, heart, lung and liver problems, and bowel disorders. An estimated 12,000 people in the UK live with the diseases.
The Chief Medical Officer for England, Professor Dame Sally Davies, explains that the 'three parent' technique does not tamper with the nucleus. It simply moves it into a cell which has healthy 'battery packs', known as mitochondria, which power the nucleus properly and eradicate serious disease.
Some groups say the proposals for three parent babies are causing worldwide concern:
Latest ITV News reports
Britain may become the first country in the world to allow babies to be born with three genetic parents to help stamp out serious diseases.