Related Experiment Video

Updated: Aug 16, 2026

Radioactive in situ Hybridization for Detecting Diverse Gene Expression Patterns in Tissue
17:38

Radioactive in situ Hybridization for Detecting Diverse Gene Expression Patterns in Tissue

Published on: April 27, 2012

Molecular evolution of color vision of zebra finch

S Yokoyama1, N S Blow, F B Radlwimmer

  • 1Department of Biology, Syracuse University, 130 College Place, Syracuse, NY 13244, USA. syokoyam@mailbox.syr.edu

Gene
|February 13, 2001
PubMed

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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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Genetics of Speciation

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The Evidence for Evolution

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Position-effect Variegation

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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Gene Duplication and Divergence

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