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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. An allele is a different form of a gene that is located in a specific place on a chromosome that controls a specific trait and is responsible for genetic variation. Alleles are inherited from parents, two per gene, one from each parent.herefore, an allele is one of a pair of alleles. Hair color is decided by alleles (sequence variations) of the gene that controls hair color. One allele might possess the trait for blond hair and another allele that of black hair.