Twins found to have different fathers after being DNA tested
A pair of twins have been found to have different fathers after their parents grew suspicious of their different looks.
The infants, now two-year-old, were sent for DNA tests after one started growing thick wavy hair while the other had thin, straight hair.
The parents, from Hoa Binh province in Vietnam, had initially been conceed that they had been given the wrong baby in the hospital.
But the tests by the Ha Noi Centre for Genetic Analysis and Technology proved the twins shared the same mother but had different fathers.
The mother's 34-year-old husband was the father to one of the twins but the second twin was not – making them bi-pateal.
This is the first reported case of bi-pateal twins, which are extremely rare, in Vietnam.
How are bi-pateal twins conceived?
Bi-pateal twins must be conceived through two acts of intercourse reasonably close together.
The lifespan of a woman's egg is just 12 and 48 hours while a man's sperm can survive between seven and 10 days.
The overlap between these times is when bi-pateal twins can be conceived.
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