Stigma- Style Microsporangium Anther Ovary Perianth Petal: Corola- Sepal: Calyx Filament Pedicel Macrospore Ovule Microspore "mother cell" MEIOSIS MEIOSIS MITOSIS MITOSIS Germinating seed Egg Seed coat Generative cel- Tube cell Endosperm - Megagametophyte (embryo sac) Embryo - Microgametophyte (pollen) Sperm Pollen grain Sperm Polen tube Pollen tube Tube nucleus Double fertilization Pollination and Fertilization Figure 14.26 This diagram shows the lifecycle of an angiosperm. Anthers and ovaries are structures that shelter the actual gametophytes: the pollen grain and embryo sac. Double fertilization is a process unique to angiosperms. (credit: modification of work by Mariana Ruiz Villareal) If a flower lacked a megasporangium, what type of gamete would it not be able to form? If it lacked a microsporangium, what type of gamete would not form?

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Embryology