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Related Flashcards
Cards In This Set
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Codominance
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A pattern of inheritance in which two alleles are both expressed in the heterozygous condition
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What is an example of codominance?
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AB blood type
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Complementation
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A phenomenon in which the presence of two different mutant alleles in the same organism produces a wild-type phenotype. It usually happens because the two mutations are in different genes, so the organism carries one copy of each mutant allele and one copy of each wild-type allele
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Conditional lethal allele
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An allele that is lethal, but only under certain environmental conditions
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What is an example of a conditional lethal allele?
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PKU
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Dominant-negative mutation
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A mutation that produces an altered gene product that acts antagonistically to the normal gene product. Shows a dominant pattern of inheritance
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Epistasis
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An inheritance pattern where one gene can mask the phenotypic effects of a different gene
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Expressivity
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The degree to which a trait is expressed
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What is an example of expressivity?
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Flowers with deep red color have a high expressivity of the red allele
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Gain-of-function mutation
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A mutation that causes a gene to be expressed in an additional place where it is not normally expressed or during a stage of development when it is not normally expressed
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Gene interaction
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When two or more different genes influence the outcome of a single trait
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Gene knockout
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When both copies of a normal gene have been replaced by an inactive mutant gene
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Gene modifier effect
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When the allele of one gene modifies the phenotypic effect of the allele of a different gene
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Gene redundancy
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The phenomenon in which an inactive gene is compensated for by another gene with a similar function
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Hemizygous
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Describes the single copy of an X-linked gene in the male. A male mammal is said to be hemizygous for X-linked genes
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