However, current research shows that part of the genotype, the EDAR gene, which was selected for because of its role in nutrient transfer in breast milk during the era of the Beringian refugium, also determines the degree to which teeth shovel. In an interview, Dr. Hlusko suggests that human populations who had the trait migrated from Asia to the Americas, thus leaving their genetic trace around the world.
However, recent studies indicate that a portion of the genotype, specifically the EDAR gene, which was chosen due to its role in nutrient transfer during breast milk in ancient times, also influences the extent to which teeth are shovel-shaped. According to Dr. Hlusko's interview, human populations possessing this trait migrated from Asia to the Americas, leaving behind their genetic legacy worldwide.