1. Review of reproductive biology

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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-variation in flowers -life cycle
-precise placement -outcrossing -pollination
syndromes
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Figure 38.2 Review of an idealized flower
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Figure 38.3a Trillium
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Figure 38.3f Sagittaria staminate flowers
(left), carpellate flowers (right)
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Figure 38.3ex Begonia, a monoecious species
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Figure 38.3d2 Aloe
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Figure 38.3b Lupines
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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-variation in flowers -life cycle
-precise placement -outcrossing -pollination
syndromes
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Life cycle of the angiosperm (flowering plant)
from the current text)
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Figure 38.1 Simplified overview of angiosperm
life cycle
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Figure 38.3ax2 Lily
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Figure 38.4 The development of angiosperm
gametophytes (pollen and embryo sacs)
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4 Microspores
Tube Cell
Generative Cell
Dispersed Pollen Grain
Pollen Coat
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Figure 38.5 Pollen grains have tough, ornate,
and distinctive walls
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Figure 38.3ax1 Lily
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Cross Section of an Ovary
One ovule just after meiosis
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Figure 38.4 The development of angiosperm
gametophytes (pollen and embryo sacs)
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Four-nuclear female gametophyte after two mitotic
divisions of the megaspore)
Mature female gametophyte
Egg
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Figure 38.9 Growth of the pollen tube and double
fertilization
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Figure 38.10 The development of a dicot plant
embryo
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http//gened.emc.maricopa.edu/bio/bio181/BIOBK/Bio
BookflowersII.html
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Figure 30.17 The life cycle of an angiosperm
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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-life cycle -variation in flowers
-precise placement -outcrossing -pollination
syndromes
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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-life cycle -variation in flowers
-precise placement -outcrossing -pollination
syndromes
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Three paths for pollen flow selfing 1.
Within flower 2. Between flowers 3.
outcrossing (between plants)
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Red Maple Flowers
staminate
pistillate
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Figure 38.3e Maize, a monoecious species
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syndromes
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Foxgloves and outcrossing
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Figure 38.3bx1 Foxglove
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Three components to outcrossing in foxglove 1.
Young flowers are male, old are female 2. Young
flowers are nearer the top 3. Bees fly up.
Male zone
Then start over at the bottom
Bees fly up
Female zone
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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-life cycle -variation in flowers
-precise placement -outcrossing -pollination
syndromes
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-pollination syndromes
Hummingbird --
-long tube -red color -abundant nectar - no
odor - no landing
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-pollination syndromes
Bat --
-abundant pollen -white or drab color -abundant
nectar - good odor - strong landing
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Banana (Musa), pollinated by bats, dispersed by
monkeys
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-pollination syndromes
Sphinx Moth --
-long tube -white color -abundant nectar -
exquisite odor (periodic) - landing
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Angraecum (Orchidaceae)
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-pollination syndromes
Carrion insect --
-contrasting light and dark
pattern -brown-purple color -no nectar - foul odor
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On the Function of Flowers
1. Review of reproductive biology 2.
Pollination Ecology
-life cycle -variation in flowers
-precise placement -outcrossing -pollination
syndromes