Sexual Reproduction in Flowering Plants
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Transcript of Sexual Reproduction in Flowering Plants
Sexual Reproduction in Flowering Plants
Flower Anatomy, Modes of Pollination, and beginning Meiosis
Flower Anatomy
Pistil
Pistil- the central part of the flower, pollen must land before seeds can form.
Stigma- sticky top of pistil, catches pollen.
Style- "stem" of pistil, tube pollen follows to ovary.
Pistil Ovary-
• base of pistil; where ovule located.
Ovule- female portion of the
plant's reproductive system.
part within plant's flower pistil - becomes seed or site of fertilized egg development.
StamenMale reproductive
organ Filament – thin stalk -
holds anther Anther – produce
pollen, male sex cell
Cross pollination – Transfer of pollen from anther of plant A to stigma on plant B.
Self pollination – pollen transferred from anther to stigma on same flower.
Modes of PollinationHow Pollen Gets Around
Modes of Pollination
Insects• Brightly colored
petals• Strong sweet
fragrance• Nectar producing
glands
Modes of Pollination
Wind Large stigmas
outside the flower Little /no
fragrance Light, non-sticky
pollen Lack showy petals
Modes of Pollination
Birds• Long tube shaped
flowers• Bright red and
yellow flowers• No odor
Modes of Pollination
Mammals Strong fruity
odor Flowers
opening at night
MeiosisFour haploid cells are produced from
one diploid cell.
Meiosis Produce haploid cells
• Haploid – gamete or sex cell – 1 set of chromosomes
• Diploid – Somatic or body cell – 2 sets of chromosomes
Meiosis Ensures that offspring have
the same number of chromosomes in diploid cells as the parent organisms.
Meiosis Overview of Meiosis Process by
Bozemanbiology’s Mr. Anderson Sketch Meiosis 1 and Meiosis 2 (p
108-109) in your notes Read “Problem Solving Activity” on
page 109