Beanbag genetics is a conceptual model of genetics which was used by early Mendelians, who used to keep colored beans in bags as a way of tracking Mendelian ratios, which British-born scientist known for his work in the study of physiology, genetics, evolutionary biology, and in mathematics, where he made innovative contributions to the fields of statistics and biostatistics, and who treated genes as independent entities to simplify their mathematical analysis of population genetics?