Flower Anatomy, Modes of Pollination, and beginning Meiosis

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.

 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.

Male 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.

same Self pollination – pollen transferred from anther to stigma on same flower.

How Pollen Gets Around

Insects Brightly colored petals Strong sweet fragrance Nectar producing glands

Wind  Large stigmas outside the flower  Little /no fragrance  Light, non-sticky pollen  Lack showy petals

Birds Long tube shaped flowers Bright red and yellow flowers No odor

Mammals  Strong fruity odor  Flowers opening at night

Four haploid cells are produced from one diploid cell.

 Produce haploid cells gamete Haploid – gamete or sex cell – 1 set of chromosomes Somatic 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.

 Overview of Meiosis Process by Bozemanbiology’s Mr. AndersonMr. Anderson  Sketch Meiosis 1 and Meiosis 2 (p ) in your notes  Read “Problem Solving Activity” on page 109