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Related Concept Videos

Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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Related Experiment Video

Updated: May 29, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
10:08

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

Published on: August 12, 2019

Next-generation mapping of complex traits with phenotype-based selection and introgression.

Eric J Earley1, Corbin D Jones

  • 1Department of Biology and Carolina Center for the Genome Sciences, University of North Carolina, Chapel Hill, North Carolina 27599-3280, USA. earleyej@email.unc.edu

Genetics
|September 24, 2011
PubMed
Summary

New genetic techniques efficiently map complex traits like food preference in fruit flies. This method uses sequencing and introgression, identifying six key genetic regions with a small population size.

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

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Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
10:08

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

Published on: August 12, 2019

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
05:53

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

Area of Science:

  • Genetics
  • Behavioral Genetics
  • Evolutionary Biology

Background:

  • Identifying genes for complex traits is challenging.
  • Traditional genetic mapping methods can be laborious and require extensive resources.
  • Quantitative behavioral traits, like food preference, are particularly difficult to dissect genetically.

Purpose of the Study:

  • To demonstrate a novel approach for efficiently mapping quantitative trait loci (QTLs) underlying complex behaviors.
  • To identify genetic regions controlling innate food preference in Drosophila.
  • To showcase the utility of combining new sequencing technologies with traditional introgression mapping.

Main Methods:

  • Phenotype-based introgression mapping was used to transfer genetic loci controlling food preference from Drosophila simulans into the genetic background of Drosophila sechellia.
  • Whole-genome resequencing at low coverage (approximately 1x) was employed to map these introgressed regions in a small mapping population (30 individuals).
  • Traditional genetic techniques were combined with advanced sequencing technology.

Main Results:

  • Six genetic loci contributing to Drosophila food preference were successfully mapped.
  • One identified locus overlaps with a previously known allele, validating the approach.
  • The method efficiently mapped genetic regions using a small population and light sequencing coverage.

Conclusions:

  • This combined approach of introgression and low-coverage whole-genome resequencing offers an efficient strategy for mapping complex traits.
  • The method is versatile, applicable across various systems, and does not require high-quality reference genomes or extensive marker development.
  • The resulting near-isogenic lines are reusable, offering a significant advantage over methods like F(2) bulk-segregant analysis.