Correct Answer: C. Superfecundation
Superfecundation is the fertilization of two or more ova by spermatozoa from different males during the same menstrual cycle, resulting in twins (or multiples) with different biological fathers. In this case, the woman had sexual intercourse with two different men during her fertile period in the same cycle. Both ova were fertilized—one by sperm from the putative father and one by sperm from another man—leading to dizygotic (fraternal) twins with different paternity. DNA testing revealed one child's genetic profile did not match the alleged father, confirming superfecundation. This is a well-recognized forensic phenomenon in India, particularly relevant in cases of disputed paternity, marital disputes, and inheritance claims. The key discriminating feature is that both conceptions occur in the same menstrual cycle from different males, resulting in twins born simultaneously but with different biological fathers. This has significant medico-legal implications under Indian law, particularly in succession and legitimacy disputes.
Why the other options are wrong
A. Superfetation — Superfetation is the fertilization of a second ovum during pregnancy (after the first conception), resulting in fetuses of different gestational ages. This requires ovulation to occur after the first pregnancy is established—a rare event because pregnancy suppresses ovulation. The twins in this case were born at the same time with similar gestational age, ruling out superfetation. NBE trap: both terms sound similar and involve multiple conceptions, but superfetation requires sequential conceptions in different cycles. B. Suppositious child — A suppositious child is one falsely represented as the legitimate offspring of a couple when actually born to another woman—essentially a substituted or fraudulently presented child. This involves deception about the identity of the child itself, not about paternity of twins born to the same mother. The question clearly states the woman gave birth to twins; there is no indication of child substitution or fraud regarding identity. D. Atavism — Atavism refers to the reappearance of ancestral characteristics (evolutionary throwback) in an individual, such as vestigial organs or primitive anatomical features. This is an anthropological/evolutionary concept unrelated to paternity, multiple conceptions, or twin births. NBE trap: students unfamiliar with forensic terminology might confuse atavism with genetic/hereditary concepts, but it has no relevance to disputed paternity cases.
High-Yield Facts
- Superfecundation = fertilization of 2+ ova by sperm from different males in the same menstrual cycle, resulting in dizygotic twins with different fathers.
- Superfetation = fertilization of a second ovum during pregnancy (after first conception), resulting in fetuses of different gestational ages—rare because pregnancy suppresses ovulation.
- Suppositious child = fraudulent substitution or false representation of a child's identity/parentage, not related to multiple conceptions.
- Superfecundation is medico-legally significant in India for paternity disputes, inheritance claims, and succession matters under Hindu Succession Act and criminal law.
- DNA testing (STR profiling) is the gold standard for confirming superfecundation by demonstrating different biological fathers in twins born to the same mother.
Mnemonics
SUPER-F vs SUPER-T SUPER-Fecundation = Fertilization of 2 ova by 2 different males in Same cycle (twins, same age). SUPER-feTation = feTation = pregnancy; fertilization during pregnancy (different ages). Use: When comparing these commonly confused terms in paternity/twin cases.
NBE Trap
NBE pairs superfecundation and superfetation to trap students who confuse the timing of conception (same cycle vs. during pregnancy) and the resulting gestational age discrepancy. The simultaneous birth of twins at similar gestational age is the key clue that rules out superfetation.
Clinical Pearl
In Indian medico-legal practice, superfecundation cases often arise in matrimonial disputes and succession litigation. Courts recognize this phenomenon as a biological reality that does not necessarily imply infidelity in the legal sense if both conceptions occurred within the same fertile window, though it has profound implications for inheritance and legitimacy under Indian succession law.
_Reference: Forensic Medicine & Toxicology (Reddy, 34th ed.) Ch. 7 – Paternity & Legitimacy; Parikh's Textbook of Medical Jurisprudence Ch. 8_