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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 is the genetic factor that determines the color of a hummingbird. An organism's physical characteristics areincluded in phenotype.ut some genes do not necessarily cause disease, and instead predispose a person to a disease. So these genetic factors determine the fitness of the individual relative to those without those particular genes.