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Related Concept Videos

Trihybrid Crosses02:27

Trihybrid Crosses

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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).
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The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an observed value. In the context of genetics, it enables us to either accept or reject a hypothesis, based on how much the observed values deviate from the expected values.
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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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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Agrobacterium-Mediated Virus-Induced Gene Silencing Assay In Cotton
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Diallel analysis for technological traits in upland cotton.

D R Queiroz1, F J C Farias2, J J V Cavalcanti2

  • 1Departamento de Agronomia, , , Brasil.

Genetics and Molecular Research : GMR
|October 4, 2017
PubMed
Summary

This study estimated general (GCA) and specific (SCA) combining abilities for cotton fiber traits. Additive genetic effects predominated, with genotype TAM B 139-17 showing the best GCA for all traits.

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Area of Science:

  • Agricultural Science
  • Genetics
  • Plant Breeding

Background:

  • Cotton fiber quality is crucial for textile production, influenced by intrinsic and extrinsic fiber characteristics.
  • Understanding genetic control of fiber traits is essential for developing improved upland cotton (Gossypium hirsutum) varieties.

Purpose of the Study:

  • To estimate general (GCA) and specific (SCA) combining abilities for technological fiber traits in upland cotton.
  • To determine the effective genetic effects controlling these traits in hybrid combinations.

Main Methods:

  • Evaluated six upland cotton genotypes and their fifteen hybrid combinations using a randomized block design.
  • Analyzed technological fiber traits including length, strength, fineness (Micronaire index), uniformity, short fiber index, and spinning index.
  • Employed diallel analysis (Griffing's methodology, method II, model I) to assess genetic variances.

Main Results:

  • Significant differences were observed among genotypes and their combining abilities (GCA and SCA), indicating genetic variability.
  • Additive genetic effects were predominant in the genetic control of all evaluated fiber traits.
  • Genotype TAM B 139-17 exhibited the best GCA estimates across all traits, while specific hybrid combinations showed significant SCA.

Conclusions:

  • Additive gene action plays a major role in controlling technological fiber traits in the studied upland cotton population.
  • Genotype TAM B 139-17 is a valuable parent for breeding programs aiming to improve multiple fiber quality traits.
  • Specific crosses identified possess high potential for superior hybrid performance, warranting further investigation.