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Not all pairs of alleles will have the same phenotype: dominance when AA = Aa in phenotype, A is dominant, a is recessive. An allele can be dominant over one allele but recessive to another allele.
Phenotype = Genotype + Environment. A phenotype is any detectable character istic of an organ ism (i.e. structural, biochemical, physiological and behavioral) determined by an inter action between its genotype and environment (see genotype-phenotype distinction and phenotypic plasticity for a ...