When natural selection causes more individuals to acquire character values at both extremes of the distribution curve while reducing intermediate forms, the mode of selection is called:
A{'text': 'Stabilising selection (favouring intermediate character values)', 'label': 'A'}
B{'text': 'Directional selection (shifting the mean character value)', 'label': 'B'}
C{'text': 'Disruptive selection (favouring both extreme character values)', 'label': 'C'}
D{'text': 'Balancing selection (maintaining a single equilibrium value)', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Disruptive selection (favouring both extreme character values)', 'label': 'C'}
The chapter classifies natural selection on continuous traits into stabilising (more individuals at the mean), directional (more individuals shifted away from the mean) and disruptive (more individuals at both peripheral ends of the distribution).
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