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La formation du pollen se realise a l'int des sacs polliniques (sporanges, 2N) qui contiennent un massif de C 2N qui subissent la meiose pour produire des spores(Prophase, metaP, anna, telo...)-> mieose reductionnelle et equationnelle-> etape la + longue : proP 1 -> donne 4 microspores (n)Liés entre elles par de la calose (les tetrades) ->puis hydrolyse des 2 couches de calose permettant des uspores qui deviennent indépendantes les unes des autres
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