WEDNESDAY MARCH 19TH

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WEDNESDAY MARCH 19TH

• WARM-UP
• 1. FIND YOUR COMPBOOK!
• 2. ANSWER IN AT LEAST 5 SENTENCES
• WHAT DO YOU THINK EVOLUTION IS AND DO YOU BELIEVE
  IN IT? WHY OR WHY NOT?

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• NEED!
• 2 LITER BOTTLES
• MAGAZINES!

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ADMINISTRIVIA

• THIS WEEK EVOLUTION
• MONDAY JUNIOR CLASS REGISTRATION
• TUESDAY- 2ND ROUND PEER EDITING

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HAPPY-FACE SPIDERS OF HAWAII
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WHY STUDY EVOLUTION?
DO YOU HAVE TO BELIEVE IN IT?
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WHY STUDY EVOLUTION?

• FIGURING OUT THE PAST CAN HELP US WITH THE FUTURE
• MEDICINES
• HOW SPECIES INTERACT
• WHERE ARE WE GOING?

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READ HANDOUT (WITH MATERIALS FOR LECTURE)
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CHARLES DARWIN (1809-1882)
FATHER OF EVOLUTION WROTE THE ORIGIN OF
SPECIES
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CHARLES DARWIN

• ORIGIN OF SPECIES DISCUSSED COMMON DESCENT
• COINED NATURAL SELECTION

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What we were SUPPOSED to find!
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EVOLUTION

• DEFINITION CHANGE OVER TIME?

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EVOLUTION

• DEFINITION- DESCENT WITH MODIFICATION
• IDEA THAT ALL LIFE ON EARTH SHARE COMMON
  ANCESTORS

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HOW DO WE REPRESENT THAT?

• Phylogeny- family tree
• the evolutionary relationships among organisms

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PHYLOGENY
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UNDERSTANDING PHYLOGENIES
REFER TO HANDOUT ON UNDERSTANDING PHYLONGENIES
(WITH MATERIALS FOR LECTURE) DRAW EACH DIAGRAM IN
YOUR NOTES
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UNDERSTANDING PHYLOGENIES
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UNDERSTANDING PHYLOGENIES
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UNDERSTANDING PHYLOGENIES
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CLADEA clade is a grouping that includes a
common ancestor and all the descendents (living
and extinct) of that ancestor.
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WHICH ARE CLADES?
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MARCH 20TH WARM UPORGANIZE THE FOLLOWING
ANIMALS INTO A PHYLOGENY
PUPPY
FLYING SQUIRREL
KITTEN
DOG
TIGER
SQUIRREL
BUNNY
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CLASS ANSWER
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EXAMPLE ANSWER (MANY POSSIBLE)Evidence used as
example is not science based, just as for an
example to set up the tree! This is an overly
simplified version- Phylogenetic trees usually
incorporate many more factors.
DOG
FLYING SQUIRREL
SQUIRREL
BUNNY
TIGER
KITTEN
PUPPY
Skin flap used for gliding evolved
Tamed felines evolved
Larger tails evolved
Herbivorous diet evolved
Omnivorous diet evolved
carnivores
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DID HUMANS EVOLVE FROM MONKEYS?

• Question we will be working to answer in next week

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HELPFUL TIP Evolution produces a pattern of
relationships A B C D among lineages that is
tree-like, not ladder-like
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HELPFUL TIP Just because we tend to read
phylogenies from left to right, there is no
correlation with level of advancement.
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HELPFUL TIP For any speciation event on a
phylogeny, the choice of which lineage goes to
the right and which goes to the left is arbitrary
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WHAT ARE TWO POSSIBLE CAUSES FOR THIS?
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