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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.
Allele is specific variation of gene and gene is section of DNA that controls certain trait. Examples of an allele are, blue eyes, green eyes, black skin. Examples of genes are skin color, eye color and blood type.