GPB (611) Advances in Quantitative Genetics (1+1) (Question Paper)

 

 

 

Answer the following:

1. Explain AMMI model. Explain the structure of AMMI ANOVA. (5 marks)

2. Explain the selection of parents to maximize the probability of deriving superior RILs as pure-line cultivars with a numerical example. (5 marks)

3. Explain the selection of parents to maximize the probability of deriving superior inbred lines for hybrid parents with a numerical example. (5 marks)

4. Mention the differences between scaling and joint scaling tests to examine the adequacy of the Additive-Dominance model. (2 marks)

5. If means of higher scoring parent (P₁) = 8; lower scoring parent (P₂) = 2, and their variances, Vₚ₁, Vₚ₂, and Vₓ₁ are 3, 2, and 1, respectively, estimated using 10 sample plants each:
   (A) Estimate m, [a], and [d]. (2 marks)
   (B) Predict the means of F₂, F₃, F₄, F₅, B₁, and B₂ assuming adequacy of the additive-dominance model. (8 marks)

6. Define heterotic groups and heterotic pattern. (1 mark)

7. Define scale and scaling test. (2 marks)