Megasporogenesis results in formation of:
Megasporogenesis occurs within ovule nucellus where subepidermal archesporial cell enlarges into megaspore mother cell undergoing meiosis I and II producing linear tetrad of four haploid megaspores with distinct animal-vegetal polarity. Three megaspores positioned toward micropyle undergo programmed cell death degenerating completely, while chalazal-most megaspore located near nutrient supply survives as functional megaspore. This selective survival establishes female germline lineage. Functional megaspore subsequently undergoes megagametogenesis involving three consecutive free nuclear mitose
Ref: Reiser & Fischer, Plant Cell 1993; Yadegari & Drews: megasporogenesis yields one large functional megaspore, three degenerate.
