Summary:
- Researchers have discovered a genetic mechanism that explains why some fish species exhibit two distinct body sizes within the same population.
- The study found that a gene called Goliath is responsible for this "dimorphism," where some individuals in the population grow to a much larger size compared to others.
- The discovery provides insights into the evolutionary processes that can lead to the emergence of different body sizes within a single species, which has implications for understanding biodiversity and adaptation.