A male-transmitted B chromosome undergoes strong meiotic drag in females

The paper operates within the paradigm of Mendelian inheritance and chromosome theory, but focuses on an exception to the standard model: the non-Mendelian inheritance of B chromosomes.

This research falls under normal science because it investigates a specific phenomenon (the inheritance of the PSR B chromosome) within the established framework of chromosome theory and Mendelian inheritance. It explores a known anomaly (B chromosomes) and seeks to explain its peculiar transmission patterns by using established experimental methods (genetic manipulation, microscopy). The study does not challenge the existing paradigm, but rather contributes to a deeper understanding of how exceptions to the paradigm operate. It adds to the accumulated knowledge within the field without proposing fundamental shifts in understanding or methodology. While the paper characterizes the PSR chromosome's unusual inheritance as “meiotic drag,” this term describes an anomaly within the paradigm rather than a challenge to the paradigm itself. The research aims to reconcile the behavior of PSR with existing knowledge about chromosome segregation and inheritance.