1. OBSERVING LIVING PROOF OF EVOLUTIONARY TRENDS
ALGAE
OBSERVING LIVING PROOF OF EVOLUTIONARY TRENDS

2. DISTINGUSHING CHARACTERISTICS OF ALGAE

3. ALL AGLAE: 1. Photosynthetic
2.  Live in aqueous environments (ie. In or near water)
3.  Lack internal tubes to move water and materials from one part of the plant to another

4. ALL ALGAE: 5. Cells have a cell wall
6.  Contain chlorophyll a (sometimes other forms of chlorophyll also)
7.  Complicated alternating sexual & asexual reproduction cycles

5. WHAT KINGDOM ARE THEY · Unicellular algae = Kingdom Protista ·
·     
Multicellular algae = Kingdom Plantae

6. GROUPS OF ALGAE
CLASSIFIED ACCORDING TO TYPES OF CHLOROPHYL & ACCESORY PIGMENTS THEY HAVE

7. GREEN ALGAE = PHYLUM CHLOROPHYTA
CONTAIN CHOROPHYLLS a & b
STORE FOOD AS STARCH

8. BROWN ALGAE = PHYLUM PHAEOPHYTA
CONTAIN CHLOROPHYLLS a & c
ALSO CONTAIN FUCOXANTHIN ACCESORY PIGMENT

9. RED ALGAE = PHYLUM RHODOPHYTA
CONTAIN CHOROPHYLL a & sometimes d
ALSO HAVE PHYCOBILIN ACCESORY PIGMENTS
LIVE DEEPER IN THE OCEANS BECAUSE PHYCOBILIN IS VERY EFFICIENT AT ABSORBING BLUE LIGHT

10. Forms of Algae

11. Unicells: single cells, motile or nonmotile

12. Colonies: Assemblage of individual cells with variable or constant number of cells that remain constant throughout the colony life

13. Coenobium: Colony with constant number of cells, which cannot survive alone; specific „tasks“ among groups of cells is common

14. Filaments: daughter cells remain attached after cell division and form a cell chain; adjacent cells share cell wall

15. MULTICELLULAR

16. MAJOR THEMES WE ARE LOOKING AT
EVOLUTION FROM UNICELLULAR TO MULTICELLULAR (Tomorrows Lab)
EVOLUTION OF SEXUAL REPRODUCTION (next week)
DOMINANT HAPLOID  DOMINANT DIPOID
ADVANTAGES & DISADVANTAGES OF AQUATIC ENVIRONEMENT(next Tuesday)