National Open University Exam Past Question BIO 301 October/November 2015

                                                                   

                                                                

                                                                 National Open University of Nigeria

                                                               14-16 Ahmadu Bello Way, Victoria Island Lagos 

                                                                         School of science and Technology

                                                                        October/November 2015 Examination 

      ^{COURSE CODE: BIO 301}

      ^{COURSE TITTLE: GENETICS 2}

      ^{TIME ALLOWED: 2hrs}

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

^{1 a. state the Haldane’s rule                    5marks}

  ^{b. describe hybrid sterility with examples                            8marks}

  ^{c. Explain the mode of occurrence of the different types of inversions           8marks}

  ^{d. describe the mechanism of balancing selection              4marks}

^{2.a. how does gene determine sex ?            3 marks}

^{b. write short note on the following} 

^{I .gene recombination           4marks}

^{ii. gene transfer}

^{iii. framshift mutation        4marks}

^{3a. enumerate the role of structural chromosomal aberrations in plant breeding               5marks}

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

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

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

^{5a. what do you understand by the term pedigree ?            3marks}

^{b.give a detailed description of a structure of virus                  6marks}

^{c. list 6 characteristics feature of haploid palnt       6marks}

^{6a. define paralogous         5marks}

^{b. write short note on the following} 

^{i. homologous               4marks}

^{ii. homoeologous                  4marks}

^{iii. paleopolyploidy                  4marks}

^{1 a.}