Evolution in volvocine algae
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Evolution in Volvocine Algae. Colonial. Unicellular. Common ancestor – not direct line. Unicellular -. Single cell. Colonial -. Different configurations. Isogamous -. Identical gametes. Eyespot -. Detect UV light. Flagella -. Propel the cell. Polar -. Anterior/posterior.

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Evolution in Volvocine Algae

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Evolution in Volvocine Algae

Colonial

Unicellular

Common ancestor – not direct line

Unicellular -

Single cell

Colonial -

Different configurations

Isogamous -

Identical gametes

Eyespot -

Detect UV light

Flagella -

Propel the cell

Polar -

Anterior/posterior

Vegetative cells -

Cannot reproduce

Reproductive cells -

New colonies

Oogamous -

Egg & sperm


Volvocine Line Beginning

http://www2.mcdaniel.edu/Biology/botf99/algaeheadpages/lowealgaef/greens/studealgae/stvov/stvolvox.htm

Chlamydomonas

Most primitive

Single celled

Bi-flagellate for movement

Isogamous


Pandorina

Large eyespots on one end

http://www.botany.hawaii.edu/faculty/webb/bot311/Chlorophyta/PandorinaLg.jpg

New colony

Polar

Isogamous

Each cell


Eudorina

Smaller

Colonial

Polar

Vegetative & reproductive

First move toward reproductive specialization

Isogamous


Volvox – colonial & polar

Daughter colonies

1000’s vegetative

Few reproductive

Large nonmotile eggs

Small sperm

Oogamous

Communication


Chlamydomonas

Gonium

Eudorina

Volvox

http://nimravid.wordpress.com/2008/04/16/evolve-multicellularity-volvox/


Symbiosis

2 different species live together

Relationship

Host - largest

Mutualism -

Both organisms benefit

Commensalism -

1 benefits, 2nd unaffected

Parasitism -

1 benefits, 2nd harmed

Co-evolve to stable relationship


Mutualism - Lichens

Algae

Fungal hyphae

Fungus & alga


Body shape = Crustose

http://www.cs-music.com/features/photos/lichen-fence.html


http://waynesword.palomar.edu/pljan98e.htm


Body shape = Foliose

http://waynesword.palomar.edu/pljan98f.htm


http://waynesword.palomar.edu/pljan98f.htm


Body shape = Fruticose

http://www.hiltonpond.org/ThisWeek010222.html


Mutualism – termite & protozoa

http://www.securitypest.com/images/TermiteAcrop.jpg


Trichonympha

  • http://www.uccs.edu/~rmelamed/MicroFall2002/Chapter%2011/Animal-like.html


  • http://www.sfu.ca/~fankbone/biol/index2.html


Commensalism - Barnacles

Home & transportation

  • http://www.learner.org/jnorth/images/graphics/u-z/gwhale_tail.jpg


Remora

http://magma.nationalgeographic.com/ngexplorer/0505/articles/gallery_1.html


  • http://www.ms-starship.com/sciencenew/symbiosis.htm


Commensalism - Bromiliad

Epiphyte


Orchids


Parasitism – host is harmed

Modified

Parasite -

Needs nourishment

Needs transportation

Needs to reproduce

Complicated life cycle


Anopheles Mosquito

Secondary host

Malaria protozoa

Sexual reproduction

Transportation


Plasmodium a protozoa

Penetrates human liver cells – asexual spores


Infected Red Blood Cells

Asexual spores reproduce until RBC ruptures

Male & female gametocytes

Mosquito = fuse to form zygote


Tapeworm eggs

Ingested by primary host

Larva


Bladder-Worm


Encysted bladder worm in meat


Primary host

Small intestine

7 meters long


Scolex

Suckers

hooks


Large & Muscular – full of fertilized eggs


Blood Fluke Eggs

From feces


Eggs hatch into ciliated larvae

Infect secondary host - snail


Mother sporocyst produces many daughters


Immature larvae in sporocyst


Larvae escape snail into water

Invade humans through skin


Adult Blood Flukes

In blood vessels

Sexual reproduction

Eggs migrate


200,000,000 People Infected

1,000,000 death annually


Liver Fluke


Liver Fluke Distribution


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