Principles of Quantitative Genetics GPB 504 (1+1) (Question Paper )

 

 

• Define breeding value in terms of average effects of genes. 1.00
• Mention the criteria to define responsiveness of a genotype to variation in environment based on Eberhart and Russel (1966) model. 1.00
• Interpret the significance and direction of ‘F’, the covariance of additive and dominance gene effects. 1.00
• Mention the relationship between breeding value and combining ability. 1.00
• Define average effect of a gene. 1.00
• Differentiate between scaling and joint scaling tests of examining the adequacy of additive-dominance model. 2.00
• Define joint-scaling tests to examine the adequacy of additive-dominance model to explain the inheritance of quantitative traits. 2.00
• Explain the method of estimating variance attributable to non-genetic sources. 2.00
• Write the structure of ANOVA for combining ability of Line × tester mating design. 2.00
• Mention the parameters to assess stability/adaptability of genotypes based on Eberhart and Russel (1966) model. 2.00
• Derive an expression for estimating population mean in terms of frequencies of alleles and their effects at a single locus. 3.00
• Explain the method of estimating additive and dominance genetic variance using variances of basic generations: parents (P₁ & P₂), F₁ (P₁ × P₂), F₂ (F₁ × F₁), B₁ (F₁ × P₁) and B₂ (F₁ × P₂). 3.00
• Explain the relative advantages and disadvantages of first degree statistics-based genetic analysis of quantitative traits. 3.00
• Explain genetic architecture of quantitative traits based on the graphical analysis of data from the progeny obtained by diallel mating design. 5.00
• Derive components of means of P₁, P₂, F₁, F₂, B₁, and B₂ generations assuming adequacy of additive-dominance model. 5.00
• Derive the expression for relationship between population mean and gene frequency. 5.00