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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


The problem of scale in evolution

Organizational scale

Natural selection

Organism phenotype

Protein phenotype

Genotype


Spatial scale
Spatial scale

rosarubicondior.blogspot.com


Time scale
Time scale

earth-time.org


The problem of scale in evolution
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 diverging populations to display morphological variation?

  • 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)


The problem of scale in evolution

0.01 million years ago diverging populations to display morphological variation?

commons.wikimedia.org

brittanica.com


The problem of scale in evolution

≥3 million years ago diverging populations to display morphological variation?

flickriver.com

flickriver.com


The problem of scale in evolution

~300 million years ago diverging populations to display morphological variation?

0000050603428.deviantart.com

cs.trinity.edu


The problem of scale in evolution

~375 million years ago diverging populations to display morphological variation?

www.cisfbr.org.uk

commons.wikimedia.org


Sequence
Sequence diverging populations to display morphological variation?

Morphology

Time


The problem of scale in evolution
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 diverging populations to display morphological variation?

  • Students will resolve the misconception that evolution occurs at a single time scale