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(fitness) Experiment 2: Locate
light and dark coloured
trees. BIO1130 Organismal Biology 56
Université d’Ottawa / University of Ottawa 10:34 AM High coal burning industry causes discoloration in some areas
igher proportion of black phenotype Peppered moth Result 1: Birds
selected most visible
Result 2: Dark trees
distribution as coal
based industry Arguments against natural selection- data is corrupt because
moths do not live on trunks but on branches. BIO1130 Organismal Biology 57
Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 10:34 AM Page 19 History of Biology before Darwin Moths rest upon their coloration
First piece of evidence for natural selection.
Is industrial melanism tainted? maybe but it is our best guess and it is
an alternate explanation/guess Peppered moth Question: Do moths “rest” on backgrounds
that match their colouration?
Question: What impact would the clean air
act, that reduced pollutant immisions have
on the moth population morphs?
Question: What happens to other moths
with light and dark colour morphs BIO1130 Organismal Biology 58
Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 10:34 AM Page 20...
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