Q.Draw a graph to show that natural selection leads to disruptive change.
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Start your 14-day free trial to unlock the full solution →A disruptive-selection graph shows the population curve splitting from one central peak into two peaks at the extremes, as the intermediate trait values are selected against.
Step 1. Plot the trait value (e.g. beak size) on the horizontal axis and the number of individuals on the vertical axis.
Step 2. Draw the original population as a single, roughly bell-shaped curve, with most individuals clustered around an intermediate trait value.
Step 3. Draw a second curve, labelled 'population after selection', in which the middle portion of the original curve has been suppressed and two separate peaks have appeared nearer the two extremes of the trait range — reflecting that nature has selected for both extreme phenotypes while eliminating the intermediates. …
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