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Trihybrid Crosses02:27

Trihybrid Crosses

Trihybrid Crosses
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).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Relative Velocity in Two Dimensions01:11

Relative Velocity in Two Dimensions

Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing vector...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
Differential Staining Technique01:26

Differential Staining Technique

Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...

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Related Experiment Video

Updated: May 25, 2026

Robust 3D DNA FISH Using Directly Labeled Probes
12:16

Robust 3D DNA FISH Using Directly Labeled Probes

Published on: August 15, 2013

Chromosome crosstalk in three dimensions.

Anita Göndör1, Rolf Ohlsson

  • 1Department of Microbiology, Tumor and Cell Biology, Nobels väg 16, Box 280, Karolinska Institute, SE-171 77 Stockholm, Sweden. anita.gondor@ki.se

Nature
|September 11, 2009
PubMed
Summary

The genome physically interacts within the nucleus, forming loops and bridges. These dynamic chromosomal interactions influence gene activity and nuclear organization, offering insights into development and disease.

Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • The genome is not static but exists in a dynamic three-dimensional (3D) nuclear space.
  • Physical interactions like chromosome loops and bridges are crucial for genome organization.
  • Understanding these interactions is key to deciphering gene regulation and nuclear architecture.

Purpose of the Study:

  • To investigate the functional implications of dynamic physical interactions within the genome.
  • To explore how chromosomal interactions contribute to gene silencing and activation.
  • To highlight the role of technical advancements in studying genome organization and plasticity.

Main Methods:

  • Utilizing advanced molecular techniques to detect and analyze physical interactions of the genome.

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Last Updated: May 25, 2026

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  • Examining chromosomal interactions at a molecular level within the 3D nuclear environment.
  • Correlating observed interactions with gene expression patterns.

    • Main Results:

    • Demonstrated that extensive and dynamic physical interactions shape the genome's 3D structure.
    • Provided evidence that chromosomal interactions play a role in regulating gene expression.
    • Showcased how technical advances enable deeper understanding of genome function.

    Conclusions:

    • Dynamic genome interactions are fundamental to nuclear architecture and gene regulation.
    • Technical progress in detecting these interactions enhances our comprehension of genome plasticity.
    • These insights are relevant to understanding development, disease, and environmental responses.