BIO 1130 Lecture 2: Darwinian Biology Notes - September 17th 2014
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BIO 1130 Full Course Notes
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Observation 1: original museum collections had all white pepped moths and by 1900 traps collected. Hypothesis 1: fitness decreased when the moths that were more visible against the background colour of the trees. Null hypothesis 1: fitness remains the same and is not affected by the background. Hypothesis 2: the bark colour of the trees has changed. Null hypothesis 2: the bark colour of the trees has not changed. Experiment 1: artificially rear light and dark morphs and place on tree and observe survival (fitness) Experiment 2: locate light and dark coloured trees. Scientists turned on a black light and looked how many moths came back. 100 black and 100 white moths got released and 80 black and 80 white came back, 20 are lost by natural causes such as moths flew away or just didn"t come back, this means the trees have not changed. When this experiment was done, 80 black moths and 10 white moths came back.
