Discussion
Which of the following statements is NOT true ?
Answer: C
The statement that is NOT true is In diversifying selection, no extreme phenotypes are favoured.
Diversifying (disruptive) selection does the opposite: it favours both extremes of the range and acts against the intermediate forms, which can split a population into two distinct types.
The other statements follow the textbook account. Directional selection favours variants at one extreme and shifts the population mean that way. Stabilizing selection acts against both extremes and favours the average. And where the favoured intermediate is a heterozygote, as with the sickle-cell allele in malarial regions, selection for the middle keeps both alleles in the population, a balanced polymorphism. So the only statement that contradicts the definitions is the one about diversifying selection.
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