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Related Concept Videos

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...
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Epistasis Analysis

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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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...

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Related Experiment Video

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BEST: Barcode Enabled Sequencing of Tetrads
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Published on: May 1, 2014

Em algorithm for mapping quantitative trait Loci in multivalent tetraploids.

Jiahan Li1, Kiranmoy Das, Guifang Fu

  • 1Center for Statistical Genetics, Pennsylvania State University, Hershey, PA 17033, USA.

International Journal of Plant Genomics
|February 15, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new statistical method for quantitative trait locus (QTL) mapping in multivalent tetraploids, accounting for double reduction. This approach enhances genetic analysis in important crops like potatoes and roses.

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Area of Science:

  • * Agricultural Science
  • * Genetics
  • * Plant Breeding

Background:

  • * Multivalent tetraploids (e.g., potato, sugarcane, rose) are crucial for agriculture and research.
  • * Quantitative trait locus (QTL) mapping in these species is complicated by cytogenetic properties like double reduction.

Purpose of the Study:

  • * To develop a statistical method for QTL mapping in multivalent tetraploids that incorporates cytogenetic properties.
  • * To enable simultaneous estimation of QTL position, effects, chromosomal pairing, and double reduction.

Main Methods:

  • * A mixture model-based statistical framework was developed.
  • * The Expectation-Maximization (EM) algorithm was used for implementation.
  • * Simulated data were used to evaluate statistical properties and validate the method.

Main Results:

  • * The method allows simultaneous estimation of key genetic parameters.
  • * Estimation precision for QTL positions, effects, and double reduction was assessed.
  • * Validation using simulated data confirmed the method's utility.

Conclusions:

  • * A novel statistical method and software tool for QTL mapping in multivalent tetraploids have been developed.
  • * This tool addresses the challenge of double reduction in genetic analysis.
  • * The method will advance genetic research and breeding in polyploid plants.