Q.How many meiotic and mitotic divisions occur during the development of male gametophyte from the microspore mother cell?

The diploid microspore mother cell (pollen mother cell) undergoes one meiotic division (meiosis I + II counted together) to yield a tetrad of four haploid microspores. Each microspore then divides mitotically once to form a two-celled pollen grain (vegetative cell + generative cell) — the first mitotic division — and in many species the generative cell divides mitotically again to give two male gametes — the second mitotic division — completing the mature male gametophyte. So overall the p …

The diploid pollen mother cell (microspore mother cell) undergoes one meiotic division (meiosis I + II, counted as a single meiotic event) to produce a tetrad of four haploid microspores. Each microspore then undergoes its first mitotic division to form a two-celled pollen grain consisting of a large vegetative cell and a small generative cell. In many angiosperms the generative cell subsequently undergoes a second mitotic division to produce two non-motile male gametes, giving the mature three-celled male gametophyte. So the complete form …