Avocados keep a 42-million-year polling schedule
Avocado flowers alternate between a female phase (receiving pollen) and a subsequent male phase (releasing pollen) over two days, a two-day cycle that has remained driven by the SDMYB gene for about 42 million years. Hass is an A-type variety, and breeders are now able to create B-type pollinizers that both pollinate and bear marketable fruit, offering higher yields with some trade‑offs in fruit quality and orchard management.