The observation that individuals afflicted with albinism also always have vision problems is an example of

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The observation that individuals with albinism have not only white hair, skin, and eyes, but also vision problems illustrates pleiotropy, where a single gene mutation affects multiple traits. In this case, the mutation affects the production of melanin not only in the skin and hair but also in the eyes, leading to vision problems. Codominance and incomplete dominance describe situations where two alleles at a locus both partly influence the phenotype, and epistasis is the interaction between genes where one gene affects the expression of another gene. None of these apply to the observation about albinism and vision problems.

The Observation That Individuals Afflicted with Albinism Also Always Have