l02: tree of life tree of life (lecture slides).pdf · 1/25/20 1 l02: tree of life biol 153/l black...
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L02: Tree of Life
BIOL 153/LBlack Hills State Univ.Ramseys
I. Changing definitions of 'plant' and 'animal'
What is a plant?
A. Two-kingdom system
Animals: mobilephysically consume fooddeterminant growth
Plants: everything else!
Animals:
Vertebrates (mammals, birds, reptiles, etc.)
Arthropods (insects, arachnids, crustaceans, etc.)
'Worms' (nematodes, flatworms, annelids, etc.)
Cnidarians (corals, jellyfish, hydroids, etc.)
Mollusks (snails, slugs, squid, octopus, etc.)
Protozoa (radiolarians, amoeba, ciliates, etc.)
Plants:
Vascular plants (angiosperms, gymnosperms, ferns etc.)
Nonvascular plants (mosses, hornworts, lichens, etc.)
Algae (green algae, red algae, brown algae, etc.)
Fungi (basidiomycetes, ascomycetes, etc.)
Protists (diatoms, dinoflagellates, slime molds etc.)
Bacteria (eubacteria, archaea)
Vascular Plants (angiosperms, gymnosperms, ferns etc.)
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Nonvascular Plants (mosses, hornworts, lichens, etc.) Algae (green algae, red algae, brown algae, etc.)
Fungi (basidiomycetes, ascomycetes, etc.) Protists (diatoms, dinoflagellates, slime molds etc.)
Bacteria (eubacteria, archaea) B. Three-kingdom system
Animals: mobilephysically consume fooddeterminant growth
Plants: everything else, except...
Bacteria: prokaryotes
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very small, single-celled, haploid, lack nuclei and organelles
Prokaryotes C. Five-kingdom system
Eukaryotes:
animals, plants, fungi, protists
Prokaryotes:
bacteria
How Organisms Eat
Autotrophy: self-feeding (makes own food)
Heterotrophy: other-feeding (eats other organisms)
Uni-cellular
Multi-cellular Immobile Mobile
Auto-trophic
Hetero-trophic
Animals x X x X x XPlants x X X x X x
Fungi X X X x XProtists X X X X X X
II. Morphology and its limits A. Morphology definition
shape, size, arrangement of parts
used to group organisms in 2-K, 3-K, 5-K systems
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B. Well-defined groups of organisms Example A: Dog Family (Canidae)
Frances (pomeranian) Hiesey (border collie)
Example A: Dog Family (Canidae) Example A: Dog Family (Canidae)
Example B: Sunflower Family (Asteraceae) Example B: Sunflower Family (Asteraceae)
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B. Well-defined groups of organisms
1. Medium to large size
2. Many traits to measure
3. Common and widespread
4. Easily observed
C. Poorly-defined groups of organisms
Example A: Bacteria Example B: Threadplants (Nemacladus)
Example B: Threadplants (Nemacladus) Example B: Threadplants (Nemacladus)
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C. Poorly-defined groups of organisms
1. Small or microscopic
2. Few traits to measure
3. Rare
4. Difficult to observe
D. Interpretation difficulties
Convergent evolution of traits: similar traits evolve in unrelated organisms asenvironmental adaptations
Example: Euphorbs, Cacti & Milkweeds
Raven p. 239
water-storing stems, leaves modified as sharp appendages
Convergent evolution of traits: similar traits evolve in unrelated organisms asenvironmental adaptations
Evolutionary loss of traits:traits lost within groups of organisms (environmental adaptation or lack-of-use)
Example: Reptiles
loss-of-limbs in snakes, Amphisbaena, and lizards
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III. Molecular data
info directly or indirectly derived from DNA
DNA
(more info in BIOL 153 Part 2!)
B. Advantages
• High info content
• All living organisms have DNA
• Few issues with convergence
• Few issues with evolutionary loss
C. Disadvantages
• Trouble and expense
• Not all organisms living!
IV. Phylogeny A. Phylogeny definition
hypothesis regarding organism relationships
based on morphology or molecular data, and expressed in graphical form
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B. 'Trees'abc
def
• Organisms(a, b, c, d, e, f)
• Groupings(a, b, c) vs. (d, e, f)(a) vs. (b, c)(d, e) vs. (f)
abc
def
• Nodes ( )common ancestor
• Brancheslength => time
abc
def
C. 'Tree' shape and form
one tree can be drawn in different ways!
C. 'Tree' shape and form C. 'Tree' shape and form
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V. Domains A. Domain definition
major organism groups defined by molecular phylogenetics
B. Three domains currently recognized
Eubacteria, Archaea, and Eukarya
Eukarya
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C. Prokaryotes
• Two highly divergent groups
• Incredible genetic + metabolic diversity
D. Eukaryotes
• One group
• Related more to Archaea
• Incredible structural diversity + complexity
VI. New view of Eukaryotes
1. Group unrelated organisms
2. Kingdoms with different sizes
A. Problems with 2-K, 3-K, 5-K systems Two-Kingdom system on Tree of Life
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Five-Kingdom system on Tree of Life B. 'Protists'
(mostly) unicellular eukaryotes w/ diverse lifestyles
protists not all closely related to each other
Five-Kingdom system on Tree of Life C. Plants and 'Algae'
land plants are natural grouping, related to green and red algae.
other 'algae' are distantly related to true plants
land plantsgreen algaered algae
brown algaegolden algaediatoms
D. Fungi
most fungi are natural grouping (and very closely related to animals)
some 'molds' are distantly related to true fungi
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fungi
slime mold
E. Supergroups
newly-named clusters identified by phylogenetics
not intuitive or familiar to most people!
Fig. 12-10Raven p. 245