Unit 6 – Lecture 3

Algae – an IntroductionAlga – plant like protist – plural, algaeunicellular or multicellular

major producer of world’s oxygensexual or asexual reproduction or both

alternation of generationsautotrophic – photosynthetic

Algae – An introductionSix Phyla of Algae

EuglenophytaBacilliarophytaDinoflagellataChlorophytaRhodophytaPhaeophyta

DiscussAll of these end in “phyta”

phyte, phyto or phyta refer to being ____________ like or being a ______________.

Euglenophytathe Euglenoidsplant-like photo-

synthesis, but animal-like movement w/ flagellum

unicellularautotroph and heterotrophasexual reproductionpellicle & red eye-spot

(eyespot)

BacillarophytaDiatomsunicellularautotrophic – photosynthetic

chlorophyll & carotenoidsasexual or sexual reproductionsilica shells, diverse shapesfood storage as OIL not starch

DinoflagellataDinoflagellates

have 2 (“di”) flagellaunicellularautotrophic –

photosyntheticchlorophyll &

carotenoids

Dinoflagellataasexual reproduction [or weird fusion…]thick cellulose platesbioluminescence can be harmful

Dinoflagellatared tide

DiscussWhich phylum of algae…

have shells made of glass?are responsible for the harmful red tides?are both auto- and hetero- trophic?

Which type(s) of algae are phytoplankton, and what great benefit do phytoplankton serve?

ChlorophytaGreen Algae – most diverseunicellular, multicellular, or colonialmost in water but

all need moistplace to survive…

Chlorophyta…a moist place like

a SLOTH! [only 2 – 4 meters per minute ]

Chlorophytacan have flagellaalternation of generations

Alternation of Generationstype of reproduction

utilizing asexual & sexual means

Alternation of Generationsoffspring generations

alternate between being haploid [1n] in one generation to being diploid [2n] the next.

Alternation of GenerationsSporophyte [2n]

produces spores [1n]through meiosis

Alternation of GenerationsSpores [1n] produce

gametophytes [1n] throughmitosis

Alternation of GenerationsGametophyte [1n]

produces gametes [1n]through mitosis

Alternation of GenerationsGametes [1n] fuse

in fertilization to produce zygote [2n]

Alternation of GenerationsZygote [2n] grows to

become embryo [2n]

Alternation of GenerationsEmbryo [2n] grows

to become sporophyte [2n]…

etc.

Discuss – What You Need to Know About Alternation of Generationstype of reproduction utilizing

_______________ & _______________ meansoffspring generations alternate between being

_______________ [1n] in one generation to being _______________ [2n] the next.

gametophytes [1n] make _______________ [1n] through mitosis

sporophytes [2n] make _______________ [1n] through meiosis

Other PhylaRhodophyta – sea weeds, red algae

Other PhylaPhaeophyta – brown algae, kelp

most in salt waterhave air bladders to keep them afloat

Discuss

What is the most diverse group of plant-like protists?

Fungus-Like ProtistsSlime Molds, Water Molds, & Downy Mildewsunicellular to colonialheterotrophic – saphrophytic have cell wallslive in moist placesall have movement at some

point in their life cycle to get to food

Fungus-Like Protists“mycota” / “mycete” – fungus or fungus-likeexamples

myxomycota – plasmodial slime moldsform a plasmodium

no cell wallno membranes

Fungus-Like Protists“mycota” / “mycete” – fungus or fungus-likeexamples

myxomycota – plasmodial slime moldsform a plasmodium

many nuclei – cells merge together into a large mass

amoeboid movement reproduce with spores

Fungus-Like Protists“mycota” / “mycete” – fungus or fungus-likeexamples

acrasiomycota – cellular slime moldscome together to reproduce

only when food is scarce – otherwise, independent

has cell membranehaploid during entire life cycle

Fungus-Like Protists“mycota” / “mycete” – fungus or fungus-likeexamples

oomycota – water molds & downy mildewsproduce flagellated

reproductive cellsvery large and

diverse group

DiscussWhat word refers to…

the color red?the color green?the color brown?plant or plant-like?fungus or fungus-like?

Homeworkcomplete the

Euglena Reading & Coloring w/s

[and finish the webquest if you haven’t done so… it’s due tomorrow]