How Plants Survived the Asteroid That Killed the Dinosaurs

An international scientific study has revealed that flowering plants survived the asteroid impact that occurred 66 million years ago by duplicating their genomes, a mechanism that provided a critical biological safeguard against the resulting environmental collapse.

The research identifies a process known as polyploidy—the duplication of entire sets of chromosomes—as the primary reason these plants avoided extinction while the dinosaurs perished. This genetic duplication acted as a form of biological insurance, allowing plants to maintain a higher degree of genetic flexibility and resilience during the extreme conditions that followed the meteorite strike.

According to the findings, polyploidy functioned as a biological superpower hidden within the DNA of plants. By doubling their genetic material, these species were better equipped to adapt to the drastic shifts in climate and habitat that characterized the post-impact era. This chromosomal accident effectively transformed into a survival strategy, ensuring that flowering plants could persist despite the global catastrophe.

The investigation, which included contributions from Belgian researchers, challenges previous norms regarding the survival rates of flora during mass extinction events. The study suggests that the ability to undergo genome duplication provided a distinct evolutionary advantage, allowing flowering plants to withstand pressures that proved fatal to other dominant life forms of the period.

While the asteroid impact led to the widespread extinction of the dinosaurs, the genetic adaptability afforded by polyploidy allowed flowering plants to not only survive but to eventually diversify. The research highlights how a fundamental change in DNA structure served as the decisive factor in the continued existence of these species.