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

  

  

Answer the following:

1. What is Fisher’s definition of the additive effect of a gene and derive the expression for additive effect using Fisher’s definition? (5 marks)

2. What is the relationship between:
   (i) Average effect of alleles and breeding value
   (ii) Breeding value and general combining ability? (2 marks)

3. Define genotype, environment, and genotype × environment interaction (GEI), and describe different types of possible GEI. Explain approaches to exploit them in plant breeding. (6 marks)

4. Explain how additive effects of genes are fixable using a numerical example. (5 marks)

5. Explain the differences between the development of homozygous genotypes for use as pure-line cultivars and as parents for hybrid cultivar development. (2 marks)