A Washington man was shocked to learn that the father of his son was his unborn twin brother.
According to reports, the 34-year-old man is the first ever reported case of a paternity test being tricked by a human chimera — a person with extra genes absorbed by an unborn twin. The man took a paternity test after his son’s blood type didn’t match either parent.
They initially feared that sperm donors might have been mixed up after they conceived with the help of fertility procedures, before a genetic ancestry test revealed the real reason for the issue.
The father’s sperm was found to have a 10 percent genetic match to the infant, due to the DNA in his sperm differing from his saliva. The man reportedly absorbed the DNA of an unborn twin, effectively making the twin his son’s father.
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Geneticist Barry Starr said chimera cases are extremely rare, BuzzFeed reported.
“Even geneticists are blown away by this,” Starr said.