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Two alleles expressed equally to produce a phenotype resembling neither of the parents.
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Incomplete dominance
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Expressed equally to produce a phenotype resembling both of the parents
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Codominant
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Multiple alleles for one trait (ie blood type: IA IB i)
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Multiple Alleles
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Alleles listed in order from most dominant to most recessive
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Dominance Series
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Markers on almost every cell of the body identifying they are the body’s cells
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Histocompatibility antigens
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Change alterations of genetic material
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Mutation
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Allele occurring in less than 1% of population
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Mutant allele
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The percentage that an allele is present in a population
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Allele frequency
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An allele occurring in more than 1% of a population
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Wild-type allele
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A gene with only one wild-type allele
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Monomorphic
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A gene with more than one wild-type allele
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Polymorphic
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Single gene determines more than one phenotype
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Pleiotropy
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An allele that negatively affects the survival of homozygote
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Recessive lethal allele
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One gene expression dependent upon another for a specific phenotypic trait
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Complementary Gene Action
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A gene interaction in which the effects of an allele at one gene hide the effects of alleles at another gene
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Epitasis
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