A large spore that develops into a female gametophyte in plants. In flowering plants, the functional megaspore undergoes mitotic divisions to form the embryo sac.
From Greek 'megas' meaning 'large' and 'spora' meaning 'seed' or 'spore'. The term was coined to distinguish these larger female spores from the smaller male microspores, reflecting the universal pattern in biology where female gametes are larger and more nutrient-rich than male gametes.
Megaspores are the ultimate survivors - typically four are produced, but three sacrifice themselves so one can become massive and nutrient-packed! This 'winner takes all' strategy ensures the surviving megaspore has enough resources to build the complex embryo sac and support early embryo development.
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