Question:medium
Husband asks for paternal testing of his twins. One twin is found to be his son & other is not. Diagnosis?
Husband asks for paternal testing of his twins. One twin is found to be his son & other is not. Diagnosis?
Show Hint
Consider which condition allows twins in the same pregnancy to have different biological fathers.
Updated On: Jun 23, 2026
- Superfecundation
- Superfoetation
- Posthumous child
- None of the above
Show Solution
The Correct Option is A
Solution and Explanation
Approach: The key clue is twins with different biological fathers confirmed on paternity testing.
$\text{Superfecundation}$ = fertilization of two ova from the same menstrual cycle by spermatozoa from two separate acts of intercourse (possibly by two different men). When the fathers are different, it is called heteropaternal superfecundation.
Why not the others?
- Superfoetation: second fertilization during an already-established pregnancy; fetuses differ in gestational age.
- Posthumous child: born after father's death; paternity is not in question here.
\[\boxed{\text{Superfecundation}}\]
$\text{Superfecundation}$ = fertilization of two ova from the same menstrual cycle by spermatozoa from two separate acts of intercourse (possibly by two different men). When the fathers are different, it is called heteropaternal superfecundation.
Why not the others?
- Superfoetation: second fertilization during an already-established pregnancy; fetuses differ in gestational age.
- Posthumous child: born after father's death; paternity is not in question here.
\[\boxed{\text{Superfecundation}}\]
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