Genetic Components of Variance and Genotypic Correlation Quiz
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Questions and Answers

What are the genetic components of variability that contribute to the total amount of genetic variation responsible for a phenotypic trait?

  • VD, VE, VG
  • VA, VG, VE
  • VA, VE, VI
  • VA, VD, VI (correct)
  • What is the genotypic intra-class correlation originally recognized by statistical geneticists?

  • Covariance among repeated evaluations
  • Correlation among repeated measures
  • Covariance between repeated measurements
  • Ratio of VG to VP (correct)
  • What does the correlation among repeated measures represent?

  • Covariance among repeated evaluations
  • Variance of Yij and Yij’
  • Covariance between Yij and Yij’ (correct)
  • Ratio of VG to VP
  • How is the correlation among repeated measures represented?

    <p>(Equation 5)</p> Signup and view all the answers

    What is the formula for the correlation among repeated measures in terms of covariance and variance?

    <p>ρ (Yij, Yij′) = Cov (Yij, Yij′) / Var (Yij) * Var (Yij′)</p> Signup and view all the answers

    What is the formula for estimating broad sense heritability?

    <p>V(G)/V(P)</p> Signup and view all the answers

    What does the genotypic variance consist of in the composition of total genotypic variance (V_G = V_A + V_D + V_I)?

    <p>The variance of breeding values due to inheritance of a particular allele</p> Signup and view all the answers

    What is the purpose of distinguishing heritability in the broad sense from the concept of repeatability?

    <p>To apply intra-class correlation to animals</p> Signup and view all the answers

    What is the formula for heritability in the narrow sense, as defined by JL Lush?

    <p>h^2 = VA/VP</p> Signup and view all the answers

    What does broad sense heritability estimate?

    <p>The extent to which phenotypes are determined by genes transmitted from parents</p> Signup and view all the answers

    The genetic components of variability responsible for a phenotypic trait include additive variance, VA, dominance variance, VD, and epistatic variance, VI.

    <p>True</p> Signup and view all the answers

    The total amount of genetic variation responsible for a phenotypic trait can be represented as VP = VG + VE.

    <p>True</p> Signup and view all the answers

    The genotypic intra-class correlation is originally recognized by statistical geneticists such as RA Fisher.

    <p>True</p> Signup and view all the answers

    The correlation among repeated measures is represented by the equation: $\rho(Y_{ij}, Y_{ij'}) = \frac{Cov(Y_{ij}, Y_{ij'})}{\sqrt{Var(Y_{ij})Var(Y_{ij'})}}$.

    <p>False</p> Signup and view all the answers

    The correlation among repeated measures is represented by the equation: $\rho(Y_{ij}, Y_{ij'}) = Cov(Y_{ij}, Y_{ij'}) \times Var(Y_{ij}) \times Var(Y_{ij'})$.

    <p>False</p> Signup and view all the answers

    Broad sense heritability is estimated using Equation 6, where V_G represents the total genetic variance and V_P represents the phenotypic variance.

    <p>True</p> Signup and view all the answers

    The narrow sense heritability, denoted as h^2, is defined by the equation h^2 = V_A / V_P, where V_A represents the additive genetic variance and V_P represents the phenotypic variance.

    <p>True</p> Signup and view all the answers

    Repeatability, as referred to by JL Lush, is a concept related to broad sense heritability.

    <p>False</p> Signup and view all the answers

    The genotypic variance consists of additive genetic variance, dominance variance, and epistatic variance, as represented by V_G = V_A + V_D + V_I.

    <p>True</p> Signup and view all the answers

    The intra-class correlation coefficient was originally recognized as heritability in the broad sense by JL Lush in 1937.

    <p>True</p> Signup and view all the answers

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