Question:
QTL analysis is used to
QTL analysis is used to
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QTL mapping helps transition animal breeding from purely phenotypic selection to genomic selection, improving the accuracy of breeding value estimations at an early age.
Updated On: Aug 5, 2026
- identify RNA polymerase binding sites
- map genes in bacterial viruses
- determine which genes are expressed at a developmental stage
- identify chromosomal regions associated with a trait
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Most economically important traits in livestock, such as milk yield, growth rate, and disease resistance, are quantitative traits.
These traits are polygenic, meaning they are controlled by multiple genes at different loci and are influenced by environmental factors.
Step 2: Detailed Explanation:
A Quantitative Trait Locus (QTL) is a specific section of DNA that correlates with variation in a quantitative phenotype.
QTL analysis is a statistical genetics method that combines phenotypic and genotypic data from a segregating population.
The workflow of QTL analysis involves:
Developing molecular markers (such as SNPs or microsatellites) across the genome.
Measuring the target quantitative trait in a large population of known pedigree.
Statistically analyzing the association between marker genotypes and phenotypic values.
This association identifies chromosomal regions containing genes that significantly influence the quantitative trait.
Identifying these regions is key for Marker-Assisted Selection (MAS) and gene discovery in animal breeding.
Step 3: Final Answer:
QTL analysis is used to identify chromosomal regions associated with a quantitative trait.
Most economically important traits in livestock, such as milk yield, growth rate, and disease resistance, are quantitative traits.
These traits are polygenic, meaning they are controlled by multiple genes at different loci and are influenced by environmental factors.
Step 2: Detailed Explanation:
A Quantitative Trait Locus (QTL) is a specific section of DNA that correlates with variation in a quantitative phenotype.
QTL analysis is a statistical genetics method that combines phenotypic and genotypic data from a segregating population.
The workflow of QTL analysis involves:
Developing molecular markers (such as SNPs or microsatellites) across the genome.
Measuring the target quantitative trait in a large population of known pedigree.
Statistically analyzing the association between marker genotypes and phenotypic values.
This association identifies chromosomal regions containing genes that significantly influence the quantitative trait.
Identifying these regions is key for Marker-Assisted Selection (MAS) and gene discovery in animal breeding.
Step 3: Final Answer:
QTL analysis is used to identify chromosomal regions associated with a quantitative trait.
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