Quiz  /  NEET MCQ on Linkage And Crossing Over

  • 1. 
    Crossing over takes place in the

  • Diakinesis stage
  • Anaphase stage
  • Pachytene stage
  • Leptotene stage

  • 2. 
    There are 4 pairs of chromosomes in a Drosophila The linkage groups present in it are

  • one more than the pair of chromosomes
  • one less than the pair of chromosomes
  • four
  • eight

  • 3. 
    Percentage of crossing over is more when

  • genes are located in a different cell
  • genes are not linked
  • linked genes are located close to each other
  • linked genes are located far apart from each other

  • 4. 
    If the percentage of crossing over between two genes is 10, then the distance between two genes will be

  • 5 morganoid
  • 10 centimorgans
  • 20 centimorgans
  • 40 map units

  • 5. 
    Alleles of different genes that are on the same chromosome can occasionally be separated by a phenomenon called

  • crossing over
  • continuous variation
  • epistasis
  • pleiotropy

  • 6. 
    Repulsion and coupling are two faces of

  • mutation
  • chiasmata
  • linkage
  • crossing over

  • 7. 
    If gene frequency between genes a and c is 2%; b and c is 13%; b and d 4%; a and b 15%; c and d 17 and a and d 19% The sequence of genes in a chromosome is

  • a,d,b,c
  • d,b,a,c
  • a,b,c,d
  • a,c,b,d

  • 8. 
    This is the reason why Mendel did not recognize linkage phenomenon in his experiments

  • he studied only pure plants
  • he did not have a powerful microscope
  • characters he studied were situated on different chromosomes
  • many chromosomes to handle

  • 9. 
    In a linear chromosome map distance between 4 loci is as follows a-b is 10%, a-d is 3%, b-c is 4% and a-c is 6% The crossover frequency between c and d is

  • 4-12%
  • 3-6%
  • 9%
  • 3%

  • 10. 
    Where does this evidence come from? – crossing over takes place at a four-stranded stage and not at two stranded stages of chromosomes

  • studies on linkage maps of chromosomes in Drosophila
  • studies of meiosis in maize
  • 4:4 organization of ascospores in Neurospora
  • 2:2:2:2 organization of ascospores in Neurospora

  • 11. 
    Crossing over occurs between

  • Non-sister chromatids of non-homologous chromosome at zygotene stage of prophase-I
  • Non-sister chromatids of homologous chromosome at pachytene stage of prophase-I
  • Non-sister chromatids of non-homologous chromosomes at pachytene stage of prophase I
  • Non-sister chromatids of homologous chromosome at zygotene stage of prophase I
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