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Related Concept Videos

Incomplete Dominance01:43

Incomplete Dominance

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Epistasis01:39

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Updated: Jul 1, 2025

Assessing Dominant-Submissive Behavior in Adult Rats Following Traumatic Brain Injury
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Dominance and multi-locus interaction.

Juan Li1, Claudia Bank1

  • 1Institute of Ecology and Evolution, University of Bern, Bern, Switzerland; Swiss Institute for Bioinformatics, Lausanne, Switzerland.

Trends in Genetics : TIG
|March 7, 2024
PubMed
Summary
This summary is machine-generated.

Dominance, typically seen as fixed, can change based on genetic background. Understanding this variable dominance and its interaction with epistasis is key for adaptation and speciation research.

Keywords:
dominance modifierepistasisfitness landscapeheterozygotehybrid incompatibilitypolygenic traits

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Area of Science:

  • Genetics
  • Evolutionary Biology

Background:

  • Dominance is conventionally a fixed genetic parameter.
  • Observed dominance can fluctuate due to genetic background effects.

Purpose of the Study:

  • To review empirical evidence of variable dominance.
  • To explore how epistatic models explain variable dominance patterns.
  • To emphasize the importance of integrating epistasis and dominance for understanding evolution.

Main Methods:

  • Literature review of empirical studies on variable dominance.
  • Analysis of theoretical models of multi-locus interactions (epistasis).

Main Results:

  • Empirical data supports the concept of variable dominance.
  • Epistatic interactions provide a framework for understanding observed dominance variations.
  • Genetic background influences the expression of dominance.

Conclusions:

  • Variable dominance is a significant factor in evolutionary processes.
  • Integrating epistasis with dominance offers a more comprehensive view of adaptation and speciation.
  • Further research integrating these concepts is essential.