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California Standards Biology

Standard 7a Preknowledge

7a) Students know why natural selection acts on the phenotype rather than the genotype of an organism.


Natural selection works directly on the expression or appearance of an inherited trait, the phenotype, rather than on the gene combination that produces that trait, the genotype. The influence of a dominant allele for a trait over a recessive one in the genotype determines the resulting phenotype on which natural selection acts.