The 'semi-identical' twins are the result of two sperm cells fusing with a single egg — a previously unreported way for twins to come about, say the team that made the finding. They found that none were. Scientists stunned by discovery of 'semi-identical' twins This article is more than 1 year old Boy and girl, now four, are only the second case of ‘sesquizygotic’ twins recorded "We know this is an exceptional case of semi-identical twins," Fisk said in the statement. But last March, doctors reportedthe first known case of semi-identical twins. A brother and sister born in Brisbane are the second reported case of semi-identical twins in the world, believed to be the result of one egg being fertilised simultaneously by two sperm. They're being called semi-identical twins, and a new study in the New England Journal of Medicine suggests such twins are rare. The authors also performed genetic tests of 968 sets of other twins presumed to be fraternal to see if any were really semi-identical. The twins, who are identical on their mother's side but share only part of their father's DNA, are the first case of semi-identical, or sesquizygotic, twins identified in Australia. The only other reported case was uncovered in 2007. Twins are normally either identical—the result of a single sperm fertilizing a single egg, which then splits and duplicates itself—or fraternal, developing from two separate eggs fertilized by two separate sperm. But “semi-identical” twins are so rare, experts say they have only identified two cases — ever. Young Queensland twins, a boy and a girl, have been identified as only the second set of semi-identical twins in the world – and the first to be identified by doctors during pregnancy. The authors wrote that there's one previous report of semi-identical twins , published in 2007.In that case, the twins also shared 100% of maternal DNA but only part of their paternal DNA.
In that case, the twins also shared 100% of maternal DNA but only part of their paternal DNA.
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