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Pollen Grain Development Formation of the Male Gamete The Stamen is Diploid • Microspore Mother Cells are found in the Anther Meiosis • 4 Haploid Cells /A Tetrad is formed • Pollen Grains Mitosis • Each Pollen Grain now has two haploid nuclei • (a) A Tube Nucleus • (b) A Generative Nucleus Each Species of Pollen is unique • Exine = Outer Protective Layer • Intine = Inner Protective Layer Mitosis • After Pollination the generative nucleus divides again • The Tube nucleus forms the pollen tube • The Generative Nucleus forms the 2 male Gametes