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The Problem of Scale in Evolution. Jillian Banks, Jeremy Brown, Cindy Gordon, Chris Gregg, Travis Marsico, Chris Osovitz, Rebecca Symula Evolution II – We Rule!!. Context. Designed for 100+ student, introductory-level course Designed for the final day of a week long module on evolution

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the problem of scale in evolution

The Problem of Scale in Evolution

Jillian Banks, Jeremy Brown, Cindy Gordon, Chris Gregg, Travis Marsico, Chris Osovitz, Rebecca Symula

Evolution II – We Rule!!

context
Context
  • Designed for 100+ student, introductory-level course
  • Designed for the final day of a week long module on evolution
  • Prior knowledge
    • Students will understand divergence from a common ancestor; i.e., they will have a tree-like rather than a ladder-like view of evolution
    • Students will understand natural selection, population, variation, inheritance, genotype, and phenotype
slide3

Organizational scale

Natural selection

Organism phenotype

Protein phenotype

Genotype

spatial scale
Spatial scale

rosarubicondior.blogspot.com

time scale
Time scale

earth-time.org

slide6
Approximately how long would you expect it to take for diverging populations to display morphological variation?
  • 100 years
  • 100,000 years
  • 1,000,000 years
  • 1,000,000,000 years
  • It varies

Response Counter

activity
Activity
  • Pair up with another person
  • Rank your cards according to instructions provided (5 min)
  • ‘A’ group pair with a ‘B’ group and compare:
    • What you based your rankings on (morphology or time)
    • The rankings themselves (2 min)
  • Flip your cards over, preserving the order of rankings. There is one correct sequence of colors which applies to both groups.
    • Do your two groups match? Why or why not? Discuss! (3 min)
slide8

0.01 million years ago

commons.wikimedia.org

brittanica.com

slide9

≥3 million years ago

flickriver.com

flickriver.com

slide10

~300 million years ago

0000050603428.deviantart.com

cs.trinity.edu

slide11

~375 million years ago

www.cisfbr.org.uk

commons.wikimedia.org

sequence
Sequence

Morphology

Time

slide13
Approximately how long would you expect it to take for diverging populations to display morphological variation?
  • 100 years
  • 100,000 years
  • 1,000,000 years
  • 1,000,000,000 years
  • It varies

Response Counter

learning outcome
Learning Outcome
  • Students will resolve the misconception that evolution occurs at a single time scale