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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