National Open University Exam Past Question BIO 301 (Genetics 2)OCTOBER/NOVEMBER 2014

                                               National Open University of Nigeria

                          14-16 Ahmadu Bello Way, Victoria Island Lagos 

                             School of science and Technology

                          OCTOBER/NOVEMBER 2014 Examination

                                   

^{COURSE CODE: BIO 301}

^{COURSE TITTLE: GENETICS 2}

^{TIME ALLOWED: 2hrs}

 ^{Instructions: ANSWER QUESTION 1 AND ANY OTHER 3 QUESTIONS}  

^{1.      a. enumerate the roles of structural chromosomal aberrations in plant breeding                                                                                                                                        5marks}

           ^{b. Account for the mode of occurrence of the different inversion                                                                                                                                                                                                   8marks}

           ^{c. sickle cell anemia is regarded as heritable disease discuss                                                                                                                                                                                                                 12 marks}

^{2. write short note on the following}

  ^{i. pleiotropism          5marks}                                                                                                                                                                                                                                                                    

  ^{ii.duffy system               5marks}                                                                                                                                                                                                       

  ^{iii. the lysogenic cycle}       5marks                                                                                                                                                                                        

^{3. how can you apply aneuploids in crop improvement and genetic studies                                                                                                                     15marks}

^{4. a. outline the steps in specialized translocation                                                                                                                                       5 marks}

   ^{b. polyploids are of significance effect   discuss                                                                                                                                          10marks}

^{5. as a human geneticist how will you diagnose sickle cell anemia and Huntington’s disease in relation to past work                                                                                                                                                                                  15marks}

^{6. write short note on the following}

 ^{i. karyotype    5marks          ii.codominance       5marks iii.dosage compensation  5 marks}  

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