unit 6 – lecture 3. algae – an introduction alga – plant like protist – plural, algae...
TRANSCRIPT
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]