Paracompletion Question 5 - CAT 2025

The sentence fits best in blank (3) because the paragraph first introduces the study, then talks about the Dutch family and the unusual behaviour found in the affected males. After mentioning behaviours such as aggression, arson, and exhibitionism, it makes sense to explain where the genetic problem was found — on the X chromosome in the p11-12 region. The paragraph can then move on to the more specific finding about the point mutation in the MAOA gene.

The other positions don’t fit as well. Blank (1) is too early because the study and the family have not been properly introduced yet. Blank (2) would interrupt the explanation of the family and the studies carried out on them. Blank (4) comes after the paragraph has already given the detailed mutation finding, so mentioning the chromosome location there would feel out of order.

Therefore, Blank (3) is the correct answer.