04_03 Genetic Complexity

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8 Terms

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Incomplete Dominance

The relationship between alleles in which a heterozygous individual displays an intermediate phenotype between the phenotypes of the two homozygous individuals

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Codominance

When two alleles are expressed simultaneously

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Polygenic Inheritance

When more than one locus (many genes) contributes to one trait

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Pleiotropy

When many traits are controlled by a single locus (gene)

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Sex-linked genes

When the gene of interest is found on the sex chromosomes (X or Y)

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Multifactorial Inheritance

When the ultimate phenotypic result of a gene is influenced by the environment that organism is in

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Norm of Reaction

The range of phenotypic outputs from a gene that is subject to multifactorial inheritance

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Mutation

a change in the DNA sequence