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In which of the following can a change be directly observed? A. alleles B. genotypes C. phenotypes D. mutations
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In which of the following can a change be directly observed? A. alleles B. genotypes C. phenotypes D. mutations

User Daniel Heinrich
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Phenotypes can be directly observed. Phenotypes are the outward appearance of an organism that express the genotype. An example of a phenotype is hair color, or eye color.
User RyanJMcGowan
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