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Home »  Biology »  Genetics

Quantitative Genetics

Topic Review on "Title":

Some traits are discontinuous: they fall into distinct classes.  Other traits do not –they are called continuous traits.  These traits are often measured and given a quantitative value, so they are also called quantitative traits.   

Causes of quantitative traits
There are two major causes of quantitative traits: multiple genes and/or environment.  When one trait is controlled by two or more genes, these are called quantitative trait loci (QTL).  Each allele of each gene may contribute differently to the trait, the end results is a normal distribution of the trait. 

Statistic tools for quantitative genetics studies
Usually we take the mean value and the variance for the measurement of the quantitative traits. In order to correlate a trait with a QTL, covariance, correlation coefficient and regression tools are used. 

Offspring phenotype estimation and response to selection
Heritability plays an important role in estimating the offspring phenotype and calculating the response to selection.  In animal breeding, it is desirable to select the better population as breeding parents.  If the heritability of the trait, the population mean and the selected mean is known, the mean of offspring population can be estimated. 

Rapid Study Kit for "Title":
Flash Movie Flash Game Flash Card
Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :

Continuous traits are those falling into distinct classes, and discontinuous traits (quantitative traits) are those do not.  Quantitative traits are caused by multiple genes and/or environment.  They are studies using many statistical tools.  The offspring phenotype and the response to selection can be estimated provided the population mean, the selected mean and the heritability is known.

Tutorial Features:
  • External concept map to indicate the relationship of quantitative genetics and other disciplines of biology
  • Internal concept map is given to show the inter-link among the content of this tutorial.
  • Chart and tables to dissect the quantitative genetics problems and problem-solving skills.
  • Examples of problem solving steps are shown in details.
  • Concise key concept sheet to summarize each sections.

"Title" Topic List:


  • Quantitative traits
  • Quantitative genetics

Cause of quantitative traits

  • Multiple genes
  • Examples of two-gene trait
  • Environment effect

Statistical tools

  • Mean
  • Variance and standard deviation
  • Correlation coefficient
  • Regression

Phenotype estimation

  • Phenotype determination
  • Genetic variations
  • VA and VD
  • Offspring phenotype estimation
  • Response to selection
  • Example

See all 24 lessons in Genetics, including concept tutorials, problem drills and cheat sheets:
Teach Yourself Genetics Visually in 24 Hours

Home »  Biology »  Genetics
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