National Open University Exam Past Question BIO 301 (Genetics 2)March/April 2015

                                                             

    National Open University of Nigeria

             14-16 Ahmadu Bello Way, Victoria Island Lagos 

            School of Science And Technology

         March/April 2015 Examination

    

      ^{COURSE CODE: BIO 301}

      ^{COURSE TITTLE: GENETICS 2}

      ^{TIME ALLOWED: 2hrs}

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

^{1. a. explains how gene determines sex?                                                                                                                                                                                                         4 marks}

     ^{b. Describe the structure of virus                                                     7 marks}                                                                                                                                                                                              

     ^{c. List the characteristic feature of haploid plant                                                                                                                                                                                 6marks}

    ^{d. how can you tell if there are any mutant colonies in a culture                                                                                                                                                           8 marks}

^{2. a. Define genetic transfer                                                                                                                                                                                                                                        1 mark}

    ^{b. describe the anti bodies and blood antigens relationships in ABO blood group                                                                                                                                                                                          6marks}

    ^{c. Account for the mode of occurrence of different inversions you know                                                                                                            8marks}

^{3.a. List the general steps of lytic cycle                                                                                                                                                                    5marks}

    ^{b. Describe the mechanism of balancing selection                                                                                                                                                                                                           3marks}

    ^{c. describe the various methods by which polyploidy can be induced                                                                                                                                                                 7marks}

^{4.a. enumerate the role of structural chromosomal aberrations in plant breeding                                                                                                                                                                              5marks}

   ^{b. Explain the defects of abundant and structural proteins                                                                                                                                                                         10marks}

^{5. a. what did you understand by the term paralogous                                                                                                                                                                                               3marks}

    ^{b. write short note on the following}

      ^{i. Gene recombination                                              4 marks}

     ^{II. Gene transfer                                  4 marks}

     ^{iii. Frame shift mutation                                            4marks}

^{6. a. outline the steps in specialized translocation                                                            5 marks}

  ^{b. polyploidy are of significant effects. Discuss                                                   10marks}

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