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Formation of male gametophytes

Explain the formation of the male gametophytes and the male gametes inside the angiosperms?

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In anthers of each of the stamen there exist the pollen sacs. Inside these pollen sacs there exist the microspore mother cells, or the microsporocytes. These cells go through the meiosis forming the microspores. Each microspore through the mitosis makes pollen grain consisting of one generative cell and one tube cell. The pollen grain is known as the male gametophyte. Whenever the pollination takes place and the pollen grain forms the contact with the stigma (the apex of pistil) the tube cell extends its cytoplasm making the pollen tube which grows to the ovary. The generative cell splits making two sperm nuclei (male gametes) which migrate through the pollen tube.

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