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plant extras - Angiosperms Production of Male Gametophyte...

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S tamen = filament + anther Angiosperms: Production of Male Gametophyte Meiosis inside anther male spores Details follow
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Meiosis in lily anther 4 haploid daughter cells, also called “pollen tetrads” Angiosperms: Production of Male Gametophyte Haploid Haploid Haploid Haploid
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From the point of view of the plant life cycle, anther = male sporangium Each of the 4 pollen tetrads = spore Because of their small size, they are called “microspores”. Angiosperms: Production of Male Gametophyte Haploid Haploid Haploid Haploid Pollen tetrads = microspores
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As anther matures, 4 microspores of a tetrad separate from each other Angiosperms: Production of Male Gametophyte Haploid nucleus of each microspore undergoes a single mitotic division Pollen Grain Mitosis Haploid Haploid Haploid Haploid The 2 resulting haploid nuclei become encased in a thick, resistant wall, forming a pollen grain .
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From the point of view of the angiosperm life cycle, a pollen grain is an immature male gametophyte, since it has been produced by the mitotic division of a spore. Angiosperms: Production of Male Gametophyte Pollen Grain Mitosis Haploid Haploid Haploid Haploid
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The pistil (female reproductive portion) is composed of the stigma, style, and ovary. Angiosperms: Production of Female Gametophyte
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Angiosperms: Production of Female Gametophyte An ovary may contain a number of ovules. Meiosis takes place inside the ovules, resulting in the production of female spores.
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