An American who passed the paternity test found out that he is an uncle for his child. The biological father of the baby turned out to be the twin brother of the man, who died many years ago in the mother's womb.
According to The Independent, doctors have witnessed a unique genetic anomaly called the "human chimera." A married couple from Washington decided to take a DNA test because their son's blood type did not match his parent's.
Husband and wife were treated for infertility, and IVF helped them become parents. Imagine their surprise when it turned out that the child's father was actually his uncle: the genes matched only by 10 percent.
As a result of ancestral research, doctors concluded that paternity belongs to the man's twin brother, who died before birth.
The phenomenon of the "human chimera" is very rare. Most often, even if such a "gene exchange" in the mother's womb does happen, they will not know about it. There is a known case of 13 years ago, when a woman turned out to be not a biological mother to her child, but an aunt.
Experts believe that such cases may increase in the future due to the widespread use of artificial insemination technologies.