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Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

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Alleles are different forms of the same gene. Humans and other diploid organisms inherit two alleles of every gene, one from each parent.

Epistasis

Epistasis

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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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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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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Related Experiment Video

Updated: May 9, 2026

Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

Published on: January 20, 2023

Distinguishing variable phenotypes from variegation caused by transposon activities.

Virginia Walbot¹

¹Department of Biology, Stanford University, Stanford, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)

|August 7, 2013

Summary

Distinguishing variable phenotypes is crucial. This study provides guidelines to differentiate transposable element-induced changes from other sources of variation in biological systems.

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Area of Science:

Genetics and Molecular Biology
Developmental Biology
Plant and Animal Sciences

Background:

Phenotypic variation is prevalent in both natural populations and laboratory settings.
Identifying the precise cause of observed phenotypic differences is essential for biological research.
Several factors, including developmental processes, environmental influences, diseases, and genetic events like somatic recombination, can lead to variable phenotypes.

Purpose of the Study:

To provide clear guidelines and illustrative examples for distinguishing phenotypes.
To differentiate phenotypes caused by transposable elements (TEs) from other sources of variation.
To aid researchers in accurately interpreting phenotypic changes in their studies.

Main Methods:

Comparative analysis of phenotypic characteristics.
Review of existing literature and case studies.
Development of diagnostic criteria for TE-mediated variation.

Main Results:

Established criteria for identifying TE-induced phenotypic variation.
Illustrated common phenotypes associated with TEs.
Delineated key differences between TE-driven phenotypes and those from developmental, environmental, or disease factors.

Conclusions:

Accurate identification of the source of phenotypic variation is critical for advancing biological understanding.
The provided guidelines facilitate the correct attribution of phenotypes to transposable elements or other biological factors.
This work supports more precise research into genetic variation and its consequences.