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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.
You will recall that genes have different forms called alleles. An allele can be recessive or dominant. A recessive allele only shows if the individual has two copies of the recessive allele. For example, the allele for blue eyes is recessive.You need two copies of the allele to have blue eyes.A dominant allele always shows, even if the individual only has one copy of the allele. For example, the allele for brown eyes is dominant. You only need one copy of the allele to have brown eyes (and two copies will still give you brown eyes).or example, the allele for blue eyes is recessive. You need two copies of the allele to have blue eyes. A dominant allele always shows, even if the individual only has one copy of the allele.