GPB (502 ) Qualifying Question paper (Question Paper )

  

  

I. Define the following: (1 Mark each)

1. Monosomics
2. Nullisomics
3. Androgenesis
4. Synapsis
5. Chiasma

---

II. Answer the following questions: (2 Marks each)

1. Do homologous chromosomes have identical genes? Explain.
2. What are the two key features of meiosis that contribute to genetic variations?
3. Explain why synapsis may lead to the exchange of genetic information?
4. What is inversion? Mention their types.
5. What are trisomics? Explain different types.

---

III. Answer the following questions: (3 Marks each)

1. What is C banding? Explain.
2. Differentiate between microsporogenesis and megasporogenesis.
3. What is triple fusion? Where and how does it take place? How is chromosome number maintained from generation to generation?
4. What is apomixis? Explain its importance in plant breeding.

---

IV. Answer the following: (5 Marks each)

1. Briefly explain the evolution of tetraploid Brassica species.
2. Explain with a diagram paracentric inversion taking "abc, defg" genes on a pair of chromosomes and inversion between "de" genes, and crossing over between "ef" genes. Explain the gametes formed after meiosis and their genetic significance.
3. Explain with a diagram Meiosis-I, taking 2n = 4.
4. Briefly describe microsporogenesis and microgametogenesis.