Extensions of Mendelian Inheritance
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Vocabulary flashcards for the Extensions of Mendelian Inheritance lecture, covering key terminology and concepts.
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32 Terms
Incomplete Dominance
A inheritance pattern where the heterozygote expresses a phenotype that is intermediate between those of the two homozygotes.
Pleiotropy
The phenomenon where a single gene influences multiple phenotypic traits.
Epistasis
A gene interaction where the effects of one gene are masked or modified by another gene.
Gene Interaction
The phenomenon where multiple genes contribute to a single trait.
Overdominance
A situation where the heterozygote has a greater reproductive success than either homozygote.
Sex-Linked Inheritance
Inheritance patterns that are associated with genes located on sex chromosomes.
Lethal alleles
Alleles that have the potential to cause the death of an organism.
Codominance
A situation where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.
Wild-Type Alleles
The most common alleles in a natural population.
Multiple Alleles
When more than two allele variants exist for a particular gene.
Genetic Polymorphism
The occurrence of two or more different alleles at a gene locus within a population.
Sex-Influenced Inheritance
A phenomenon where an allele is dominant in one sex but recessive in another.
Semilethal Alleles
Alleles that are lethal to some individuals but not to all within a population.
Norm of Reaction
The pattern of phenotypic expression of a single genotype across a range of environments.
Temperature-Sensitive Lethal Alleles
Alleles that only exhibit lethal effects under specific environmental conditions.
Suppressor Mutation
A mutation that reverses the effect of another mutation, restoring the original phenotype.
Incomplete Dominance
A inheritance pattern where the heterozygote expresses a phenotype that is intermediate between those of the two homozygotes.
Pleiotropy
The phenomenon where a single gene influences multiple phenotypic traits.
Epistasis
A gene interaction where the effects of one gene are masked or modified by another gene.
Gene Interaction
The phenomenon where multiple genes contribute to a single trait.
Overdominance
A situation where the heterozygote has a greater reproductive success than either homozygote.
Sex-Linked Inheritance
Inheritance patterns that are associated with genes located on sex chromosomes.
Lethal alleles
Alleles that have the potential to cause the death of an organism.
Codominance
A situation where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.
Wild-Type Alleles
The most common alleles in a natural population.
Multiple Alleles
When more than two allele variants exist for a particular gene.
Genetic Polymorphism
The occurrence of two or more different alleles at a gene locus within a population.
Sex-Influenced Inheritance
A phenomenon where an allele is dominant in one sex but recessive in another.
Semilethal Alleles
Alleles that are lethal to some individuals but not to all within a population.
Norm of Reaction
The pattern of phenotypic expression of a single genotype across a range of environments.
Temperature-Sensitive Lethal Alleles
Alleles that only exhibit lethal effects under specific environmental conditions.
Suppressor Mutation
A mutation that reverses the effect of another mutation, restoring the original phenotype.
