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Plant Reproduction Anther Microspore (n) forms pollen grain Pollen grain (male gametophyte) Top of stamen Ovule Ovary Bottom of carpel Megasporangium Mature sporophyte flower (2n) Megaspore (n: retained in ovary) Nutritive tissue (3n) Female gametophyte (n: retained in ovary) Endosperm (3n) forms nutritive tissue in seed Embryo (2n) Zygote (2n) Developing sporophyte Seed (disperses via wind or animals) Egg stigma style The carpel ovary ovule megasporocyte micropyle Creation of the megaspore megaspore Creation of the megaspore Creation of the female gametophyte Polar nuclei Egg nucleus Creation of the female gametophyte Polar nuclei Egg cell Mature female gametophyte = embryo sac Review: meiosis Megasporocyte (2N) Megaspore (N) Megaspore (N) Mitosis and rearrangement Female gametophyte contains the egg cell Female gametophyte (N) Stamen anther filament Pollen sac microsporocyte Cross section of an anther microspore microsporocyte Creation of microspores Review: meiosis microspore microsporocyte Creation of microspores Next step: creation of male gametophyte exine Generative cell Tube cell nucleus Pollen grain pollination Pollen germination Generative nucleus Tube nucleus sperm Tube nucleus Mature Male gametophyte sperm Tube nucleus Review: meiosis microsporocyte (2N) microspore (N) microspore (N) Mitosis and rearrangement Male gametophyte contains the sperm Male gametophyte (N) Polar nuclei Egg cell sperm Tube nucleus Polar nuclei Egg cell sperm Tube nucleus Primary Polar endosperm nuclei nucleus 3N 2N Zygote Egg cell Double Fertilization Seed coat endosperm embryo fruit Bean seed (typical eudicot) Corn seed (typical monocot) Seed coat Endosperm Cotyledons Embryonic stem and root