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Proportional Relationships in Biology

Proportional Relationships in Biology. Bell Ringer…. Are 2/3 and 6/12 proportional? No; 6/12 = 1/2 ≠ 2/3 Are 2/3 and 10/15 proportional? Yes; 2/3 = (2*5)/(3*5) = 10/15 Are 2/3 and 4/9 proportional? No; both are simplified. Proportional Shapes.

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Proportional Relationships in Biology

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  1. Proportional Relationships in Biology

  2. Bell Ringer… • Are 2/3 and 6/12 proportional? • No; 6/12 = 1/2 ≠ 2/3 • Are 2/3 and 10/15 proportional? • Yes; 2/3 = (2*5)/(3*5) = 10/15 • Are 2/3 and 4/9 proportional? • No; both are simplified

  3. Proportional Shapes • What does it mean for two shapes to be similar or proportional? • Same shape, different size. Photo by Simon Stump

  4. Proportional Shapes Height=4 Width = 4 Width=4 Width = 10 Height = 10 Height=10

  5. Proportional Relationships in Biology • In biology, some relationships are proportional, and some are not. • This will sometimes tell us something about the organism.

  6. Proportional Relationships in Biology • Does body shape change with age? • Is a human baby proportional to a human adult? Smaller Heads Image by Shaun Mitchem and Steve Herbert www.wikipedia.org

  7. Proportional Relationships in Biology • In frogs, a small frog and a big frog do look the same… Photo credit: Simon Stump

  8. Proportional Relationships in Biology • Which has proportionately bigger legs: an ant, or an elephant? • An elephant is 3.3 m tall, and has a foot 0.5 m wide. • An ant is 4 mm tall, and has a foot 0.06 mm wide.

  9. Photos by PHGCOM and Peter H. Wrege, retrieved from Wikipedia

  10. Proportions in plants • Are large and small plants proportional? Pictures by Mark Hofstetter and Amada44, downloaded from Wikipedia

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