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Related Concept Videos

Dihybrid Crosses01:18

Dihybrid Crosses

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Dihybrid Crosses

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Monohybrid Crosses01:20

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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...
Test Cross01:39

Test Cross

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

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Backcross assisted by microsatellite markers in common bean.

L K Oliveira1, L C Melo, C Brondani

  • 1Departamento de Biologia, Universidade Católica de Goiás, Goiânia, GO, Brasil.

Genetics and Molecular Research : GMR
|December 3, 2008
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Summary

Marker-assisted backcrossing accelerates bean breeding by efficiently recovering elite parent genomes. This molecular marker technology reduces backcross generations and speeds up recurrent parent genome recovery.

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Area of Science:

  • Plant Breeding
  • Molecular Genetics
  • Agricultural Science

Background:

  • Bean golden mosaic virus (BGMV) resistance is crucial for bean production.
  • Backcrossing is a common method to introgress desirable traits, but can be time-consuming.
  • Marker-assisted selection (MAS) offers potential to improve breeding efficiency.

Purpose of the Study:

  • To evaluate the effectiveness of backcrossing using microsatellite markers.
  • To compare different marker-assisted selection strategies in bean breeding.
  • To assess the efficiency of recurrent genome recovery in segregant populations.

Main Methods:

  • Development of four populations using BGMV-resistant donor parents.
  • Microsatellite marker genotyping (20 markers) in each generation.
  • Analysis of molecular data using NTSys for genome introgression estimation.

Main Results:

  • Marker-assisted backcrossing demonstrated higher efficiency in recovering elite parent genotypes.
  • Selection strategies varied in effectiveness depending on the generation of application.
  • Successful application of molecular markers reduced the number of backcrosses required.

Conclusions:

  • Molecular marker technology significantly enhances bean breeding programs.
  • MAS accelerates the recovery of recurrent parent genomes, saving time and resources.
  • This approach provides a practical tool for developing improved bean varieties.