vastavalt mudelile organite tüüp ja asetus igas õieosade (tupplehed, kroonlehed, tolmukad, viljalehed) ringis määratletakse kolme (A, B, C) organeid identifitseerivate homeootiliste MADS geenide produktide kombineerumise teel, ABC model of flower development is a scientific model of the process by which flowering plants produce a pattern of gene expression in meristems that leads to the appearance of an organ oriented towards sexual reproduction, a flower