Exam 21: Genetic Analysis of Quantitative Traits

Of the variance and the standard deviation for a set of data about a trait, which represents the square of the difference between each of the values and the mean of the sample, divided by the degrees of freedom?

What is the statistically acceptable lod score that provides evidence of genetic linkage?

If a trait results from the action of several genes, it is called a ________ trait.

A hypothetical condition in some domesticated fowl is identified phenotypically by patchy loss of feathers on the animals' backs. Although several factors, genetic and environmental, are found to be involved, only about 3% of any population with any of these factors are found with feather loss. Which of the following is a likely cause?

Calculate the narrow sense heritability (h₂)for the following data on a trait in turkeys: V_A = 11.0 V_E = 94.4 V_P = 114.2 V_D = 13.8

For the following traits, the concordances (occurrence of the same phenotype)of MZ and DZ twins are given as percentages. Which trait shows the most genetic as opposed to environmental influence?

Which component of variance in a trait such as stamina in horses is the best indicator of whether the trait will respond to selection?