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Related Concept Videos

Complementation Tests00:49

Complementation Tests

A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
Types of Genetic Transfer Between Organisms02:18

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
Types of Genetic Transfer Between Organisms02:18

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
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...
Improving Translational Accuracy02:07

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...

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Related Experiment Video

Updated: Jul 3, 2026

A Method for Investigating Change Blindness in Pigeons (Columba Livia)
06:14

A Method for Investigating Change Blindness in Pigeons (Columba Livia)

Published on: September 7, 2018

Multiple-pair training enhances transposition in pigeons.

Olga F Lazareva1, Michelle Miner, Edward A Wasserman

  • 1Department of Psychology, University of Iowa, Iowa City, Iowa 52242, USA. olga-lazareva@uiowa.edu

Learning & Behavior
|August 8, 2008
PubMed
Summary
This summary is machine-generated.

Multiple-pair discrimination training significantly enhanced transposition in pigeons, improving their ability to learn relational rules. This suggests that encountering more examples strengthens learning, even against prior expectations.

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Last Updated: Jul 3, 2026

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RBDT: A Computerized Task System based in Transposition for the Continuous Analysis of Relational Behavior Dynamics in Humans

Published on: July 17, 2021

Area of Science:

  • Comparative Psychology
  • Animal Cognition
  • Behavioral Neuroscience

Background:

  • Transposition is a key phenomenon in understanding relational learning and concept formation.
  • Previous research suggested generalization gradients might predict transposition outcomes.
  • An earlier study indicated potential for increased transposition with more training pairs.

Purpose of the Study:

  • To investigate the effect of multiple-pair discrimination training on transposition in pigeons.
  • To test predictions derived from postdiscrimination generalization gradients versus an alternative hypothesis.
  • To examine how stimulus similarity influences relational responding in transposition tasks.

Main Methods:

  • Pigeons were trained on a size discrimination task using one, two, or three pairs of circles.
  • Testing involved novel stimulus pairs to assess transposition.
  • Data analysis focused on the percentage of transposition across different training conditions.

Main Results:

  • Multiple-pair discrimination training significantly enhanced transposition, increasing from 47% to 64% with more training pairs.
  • Contrary to generalization gradient predictions, transposition improved with increased training instances.
  • The similarity between testing and training stimuli modulated the strength of relational responding.

Conclusions:

  • Exposure to multiple instances of a rule strengthens relational learning in pigeons.
  • These findings challenge the notion that stimulus generalization is the sole driver of transposition.
  • The results highlight the importance of varied experiences in developing robust cognitive abilities.