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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

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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...
Mutations in Microorganisms01:18

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
Dihybrid Crosses01:18

Dihybrid Crosses

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Mutations01:39

Mutations

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Related Experiment Video

Updated: May 25, 2026

Development of Targeting Induced Local Lesions IN Genomes (TILLING) Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis
08:36

Development of Targeting Induced Local Lesions IN Genomes (TILLING) Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis

Published on: July 16, 2019

Mutations in lettuce improvement.

Beiquan Mou1

  • 1Agricultural Research Service, United States Department of Agriculture (USDA), 1636 East Alisal Street, Salinas, CA 93905, USA.

International Journal of Plant Genomics
|January 31, 2012
PubMed
Summary
This summary is machine-generated.

Mutation breeding in lettuce generates genetic diversity for crop improvement. This nontransgenic approach is consumer-friendly and aids in developing new cultivars and understanding plant genetics.

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Area of Science:

  • Plant genetics
  • Crop improvement
  • Mutation breeding

Background:

  • Lettuce is a globally significant vegetable crop.
  • Genetic variations, driven by mutations, were crucial for lettuce domestication.
  • Mutations have yielded traits beneficial for research and product development.

Purpose of the Study:

  • To explore the role of mutations in lettuce genetic improvement.
  • To highlight the utility of mutants in physiological, genetic, and genomic studies.
  • To review diverse mutagenesis approaches for lettuce.

Main Methods:

  • Utilizing natural and induced mutations (radiation, chemical mutagens).
  • Employing unconventional methods like tissue culture, transposable elements, and space flight.
  • Integrating mutagenesis with genomic technologies for gene discovery.

Main Results:

  • Mutations have produced useful traits like dwarfing, early flowering, and male sterility.
  • Mutants have led to the development of novel lettuce products, including miniature and herbicide-tolerant varieties.
  • Mutant analysis has been key in identifying and cloning disease-resistance genes in lettuce.

Conclusions:

  • Mutagenesis is a powerful tool for lettuce genetic studies and breeding.
  • Combining mutagenesis with genomics accelerates the discovery of new gene alleles.
  • Nontransgenic mutation breeding offers a consumer-accepted pathway for future lettuce improvement.