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