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Unformatted text preview: of Ottawa 10:34 AM Why is there a change in predominance
This brings a about hypotheses
-visible moths are more preyed upon
- have trees colorations changed? Peppered moth Observation 1: Original museum
collections had all white peppered
moths and by 1900 traps collected 90%
Question 1: Why did the moths shift
from light to dark morphs? BIO1130 Organismal Biology 54
Université d’Ottawa / University of Ottawa BIO1130 Organismal Biology 10:34 AM Page 18 History of Biology before Darwin Peppered moth Hypothesis 1: Fitness decreased when the moths
that were more visible against the background
colour of the trees.
Null hypothesis1: Fitness remains the same and is
not affected by the background.
Hypothesis 2: The bark colour of the trees has
Null hypothesis 2: The bark colour of the trees has
not changed. BIO1130 Organismal Biology 55
Université d’Ottawa / University of Ottawa 10:34 AM Peppered moth
Artificially rear light
and dark morphs and
place on tree and
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