stigma

style

ovary

ovule

megasporocyte

micropyle

The carpel

Megasporogenesis

megaspore

Megasporogenesis

Megagametogenesis

antipodalsPolarnuclei

synergids

Eggnucleus

Megagametogenesis

antipodalsPolarnuclei

synergids

Eggcell

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

microsporocyte microsporemeiosis

microsporogenesis

Review:

Next step: microgametogenesis

exine

Pollen grain

Generative cellTube cellnucleus

pollination

Tube nucleus

Generativenucleus

Pollen germination

Tube nucleus

sperm

sperm

Tube nucleus

Maturemicrogametophyte

Review:

microsporocyte(2N)

microspore(N)

meiosis

microspore(N)

microgametophyte(N)

Mitosis and rearrangement

microgametophyte contains the sperm

antipodalsPolarnuclei

synergids

Eggcell

sperm

Tube nucleus

antipodalsPolarnuclei

synergids

Eggcell

sperm

Tube nucleus

Polarnuclei

Eggcell

2N

Zygote

3N

Primaryendospermnucleus

Double Fertilization

endosperm

embryo

Seed coat

fruit