The relationship between malaria and the Hb^S allele is an example of natural selection as a factor that can cause directional change in allele frequencies.

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The Hb^S allele provides some resistance against malaria. Individuals who carry this allele are less likely to contract severe forms of malaria, which increases their chances of survival and reproduction. As a result, the frequency of the Hb^S allele can increase in populations where malaria is common, which is an example of natural selection causing directional change in allele frequencies.

The Relationship Between Malaria and the HbS Allele Is an Example

The Relationship Between Malaria and the Hb^S Allele Is an Example