Stigma style ovary ovule megasporocyte micropyle The carpel.

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Presentation transcript:

stigma style ovary ovule megasporocyte micropyle The carpel

Megasporogenesis

megaspore Megasporogenesis

Megagametogenesis

antipodals Polar nuclei synergids Egg nucleus Megagametogenesis

antipodals Polar nuclei synergids Egg cell Mature female gametophyte = embryo sac

Review: Megasporocyte (2N) Megaspore (N) meiosis Megaspore (N) Megagametophyte (N) Mitosis and rearrangement Megagametophyte contains the egg cell

Stamen anther filament

Pollen sac Cross section of an anther microsporocyte

microsporogenesis microspore microsporocyte

microspore meiosis microsporogenesis Review: Next step: microgametogenesis

exine

Pollen grain Generative cell Tube cell nucleus

pollination

Tube nucleus Generative nucleus Pollen germination

Tube nucleus sperm

Tube nucleus Mature microgametophyte

Review: microsporocyte (2N) microspore (N) meiosis microspore (N) microgametophyte (N) Mitosis and rearrangement microgametophyte contains the sperm

antipodals Polar nuclei synergids Egg cell sperm Tube nucleus

antipodals Polar nuclei synergids Egg cell sperm Tube nucleus

Polar nuclei Egg cell 2N Zygote 3N Primary endosperm nucleus Double Fertilization

endosperm embryo Seed coat fruit

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