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

  

  

Answer the following:

1. Using a numerical example considering three genotypes and three environments, estimate genotype and environment main effects and GEI effects.
   (10 marks)

2. Using a numerical example considering 4 genotype means; one of them being a tester, demonstrate:
   (A) Selection of the best pair of parents to develop breeding populations to identify the best pure line for use as a pure-line cultivar (5 marks)
   (B) Selection of the best pair of parents and tester to develop breeding populations to identify the best homozygous genotype for use as hybrid parent (5 marks)

3. Mention the situations under which F₂ and limited backcross populations are used to derive homozygous genotypes for use as pure-line cultivars and hybrid parents.
   (2 marks)

4. Differentiate between scaling and joint scaling tests.
   (3 marks)

5. Explain the principle of estimating variance attributable to non-genetic sources and estimate non-genetic sources of variation if Vₚ₁, Vₚ₂, and Vₓf₁ are 3, 2, and 1, respectively.
   (2 marks)

6. Derive components of means of P₁, P₂, F₁, F₂, F₃, F₄, B₁, and B₂ generations.
   (8 marks)