Castle's conclusion was based on the observation that novel traits that could be studied in the lab and that show Mendelian inheritance patterns reflect a large deviation from the wild type, and Castle believed that acquisition of such features is the basis of "discontinuous variation" that characterizes speciation.
As conclusións de Castle estaban baseadas na observación de que novos trazos que poden ser estudados no laboratorio e que mostran patróns de herdanza mendeliana reflicten unha gran desviación do tipo silvestre, e Castle cría que a adquisición de tales características é a base da "variación descontinua" que caracteriza a especiacion.