DOCTORS say they have discovered the world’s second known case of semi-identical twins born from one egg and two sperm. The now four-year-old boy and girl, from Brisbane, Australia, are ident…
DOCTORS say they have discovered the world's second known case of semi-identical twins born from one egg and two sperm.
Prof Nicholas Fisk, who led the team that cared for the mum and twins at the Royal Brisbane and Women's Hospital in 2014, said the discovery was made through a routine scan. Prof Fisk added: "It is likely the mother's egg was fertilised simultaneously by two of the father's sperm before dividing."Identical twins result when cells from a single egg fertilised by a single sperm divide into two - so they are the same gender and share identical DNA.
He said: "Three sets of chromosomes are typically incompatible with life and embryos do not usually survive. On investigation of mixed chromosomes, doctors found the boy and girl were identical on their mother's side, but shared around half of their paternal DNA.
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