Alana Saarinen loves playing golf and the piano, listening to music and hanging out with friends. In those respects, she's like many teenagers around the world. Except she's not, because every cell in Alana's body isn't like mine and yours - Alana is one of a few people in the world who have DNA from three people.
"A lot of people say I have facial features from my mum, my eyes look like my dad… I have some traits from them and my personality is the same too," says Alana.
"I also have DNA from a third lady. But I wouldn't consider her a third parent, I just have some of her mitochondria."
Mitochondria are often called the cell's factories. They are the bits that create the energy all of our cells need to work, and keep the body functioning. But they also contain a little bit of DNA.
Alana Saarinen is one of only 30 to 50 people in the world who have some mitochondria, and therefore a bit of DNA, from a third person. She was conceived through a pioneering infertility treatment in the USA which was later banned.
But soon there could be more people like Alana, with three genetic parents, because the UK is looking to legalise a new, similar technique which would use a donor's mitochondria to try to eliminate debilitating genetic diseases. It is called mitochondrial replacement and if Parliament votes to let this happen, the UK would become the only country in the world to allow children with three people's DNA to be born.
Извор: http://www.bbc.com/news/magazine-28986843
Преп. Јоаникиј Велики; Св. свештеномаченик Никандар, епископ Мирски и Ермеј презвитерот; 
