Does a genotype have to display a phenotype?

Does a genotype have to display a phenotype?
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I am no genetic expert, but I believe this can happen. For example, two humans can have brown eyes. This would be their phenotype. One person could have an allele for brown eyes and an allele for blue eyes, but because the allele for brown eyes is dominant, this is the phenotype. the other person could have two alleles for brown eyes so obviously this is the phenotype that would be expressed. They have the same phenotype and different genotypes.
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