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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.

CALIFORNIA FRAMEWORKS SUMMARY:

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.