Magnoliophyta.

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Presentation transcript:

Magnoliophyta

Magnoliposida The dicotyledons

Liliopsida The monocotyledons

stigma style ovary The carpel ovule megasporocyte micropyle

Creation of the megaspore

megaspore Creation of the megaspore

Creation of the female gametophyte

antipodals Polar nuclei synergids Egg nucleus Creation of the female gametophyte

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

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

Stamen anther filament

Pollen sac microsporocyte Cross section of an anther

microspore microsporocyte Creation of microspores

Review: meiosis microsporocyte microspore Creation of microspores Next step: creation of male gametophyte

exine

Tube cell nucleus Generative cell Pollen grain

pollination

Pollen germination Generative nucleus Tube nucleus

sperm Tube nucleus

Mature Male gametophyte sperm Tube nucleus

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

antipodals Polar nuclei synergids Egg cell Tube nucleus sperm

antipodals Polar nuclei synergids Egg cell Tube nucleus sperm

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

Seed coat endosperm embryo fruit

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