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Chapter 28: Problem 12

What is a quantitative trait locus (QTL)? Does a QTL contain one gene or multiple genes? What technique is commonly used to identify QTLs?

Short Answer

Expert verified
A Quantitative Trait Locus (QTL) is a section of DNA which correlates with variation in a phenotype for a quantitative trait. A single QTL can contain multiple genes, not necessarily one. QTL mapping is the commonly used technique to identify QTLs.

Step by step solution

01

Define Quantitative Trait Locus

Quantitative Trait Loci (QTL) can be defined as sections of DNA (i.e., genes) which correlate with variation in a phenotype for a quantitative trait. A QTL contains the genes which could potentially be causing the variation in a trait.
02

Discuss the number of genes a QTL Contains

A single QTL can contain multiple genes. In other words, a QTL doesn't necessarily correspond to a single gene but could span more than one. It is called a 'locus' which typically refers to the position on a chromosome where a gene is located. However, in the case of a QTL, it refers to a stretch of DNA containing one or more genes that are associated with the trait.
03

Explain the Identification Technique for QTLs

Quantitative trait loci can be identified through a genetic technique called QTL mapping. This involves studying the genetic markers that segregate within a population and are statistically associated with the phenotypic traits. Therefore, QTL mapping helps in locating the specific regions in the genome that may be contributing to a quantitative trait.

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Most popular questions from this chapter

What is a normal distribution? Discuss this curve with regard to quantitative traits within a population. What is the relationship between the standard deviation and the normal distribution?

At the molecular level, explain why quantitative traits often exhibit a continuum of phenotypes within a population. How does the environment help produce this continuum?

What is a frequency distribution? Explain how such a graph is made for a quantitative trait that is continuous.

What is the difference between broad-sense heritability and narrow-sense heritability? Why is narrow-sense heritability such a useful concept in the field of agricultural genetics?

Two different varieties of potato plants produce potatoes with the same mean weight of \(1.5\) pounds. One variety has a very low variance for potato wieght, and the other has a much higher variance. A. Discuss the possible reasons for the differences in variance. B. If you were a potato farmer, would you rather raise a variety with a low or high variance? Explain your answer from a practical point of view. C. If you were a potato breeder and you wanted to develop potatoes with a heavier weight, would you choose the variety with a low or high variance? Explain your answer.
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