NEET Biology Principle Of Inheritance And Variation Question Bank

done Linkage and Crossing Over Total Questions - 35

• question_answer1)
  The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from [DPMT 1993]
  A)
  2 : 2 : 2 : 2 arrangement of ascospores in Neurospora done clear
  B)
  4 : 4 arrangement of ascospores in Neurospora done clear
  C)
  Studies of meiosis in maize done clear
  D)
  Studies on linkage maps of chromosomes in Drosophila done clear
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• question_answer2)
  Mendel did not recognize the linkage phenomenon in his experiments because [CMC Vellore 1993]
  A)
  There were many chromosomes to handle done clear
  B)
  Characters he studied were located on different chromosomes done clear
  C)
  He did not have powerful microscope done clear
  D)
  He studied only pure plants done clear
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• question_answer3)
  Coupling and repulsion are the two faces of [JIPMER 1994]
  A)
  Crossing over done clear
  B)
  Linkage done clear
  C)
  Chiasmata done clear
  D)
  Mutation done clear
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• question_answer4)
  The map distance between genes A and B is 3 units, between B and C 10 units and between C and A 7 units. The order of the genes in a linkage map constructed on the above data would perhaps be [CMC Vellore 1994]
  A)
  A, B, C done clear
  B)
  A, C, B done clear
  C)
  B, C, A done clear
  D)
  B, A, C done clear
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• question_answer5)
  Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as [MP PMT 1993]
  A)
  Pleotropy done clear
  B)
  Epistasis done clear
  C)
  Continuous variation done clear
  D)
  Crossing over done clear
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• question_answer6)
  Which one of the following pairs is correctly matched [MP PMT 1993]
  A)
  Morgan Discovered the process of linkage done clear
  B)
  Linus Pauling Isolated DNA for the first time done clear
  C)
  Francis Crick Discovered the phenomenon of transformation done clear
  D)
  H. Khorana Discovered that a sequence of 3 nucleotides codes for a single amino acid done clear
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• question_answer7)
  The percentage of crossing over will be more if
  A)
  Linked genes are located far apart from each other done clear
  B)
  Linked genes are located close to each other done clear
  C)
  Genes are not linked done clear
  D)
  Genes are located in a different cell done clear
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• question_answer8)
  Drosophila has four pairs of chromosomes. How many linkage groups does it have
  A)
  Eight done clear
  B)
  Four done clear
  C)
  One less than the pairs of chromosomes done clear
  D)
  One more than the pairs of chromosomes done clear
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• question_answer9)
  Linkage in Drosophila was first discovered by
  A)
  Morgan done clear
  B)
  Bateson and Punnet done clear
  C)
  Sturtevant done clear
  D)
  Bridges done clear
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• question_answer10)
  Chiasmata firstly seen in [RPMT 1995; MP PMT 2003]
  A)
  Leptotene done clear
  B)
  Zygotene done clear
  C)
  Pechytene done clear
  D)
  Diplotene done clear
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• question_answer11)
  Crossing-over occurs in the [Bihar MDAT 1995; MP PMT 1995; JIPMER 2002]
  A)
  Leptotene stage done clear
  B)
  Pachytene stage done clear
  C)
  Anaphase stage done clear
  D)
  Diakinesis stage done clear
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• question_answer12)
  Mendel observed that some characters did not assort independently. Later researchers found it to be due to [MP PMT 1995, 98]
  A)
  Crossing-over done clear
  B)
  Linkage done clear
  C)
  Dominance of one trait over the other done clear
  D)
  Amitosis done clear
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• question_answer13)
  Exchange of genetic material between chromatids of homologous chromosomes during meiosis is called [CBSE PMT 1996]
  A)
  Synapsis done clear
  B)
  Chiasmata done clear
  C)
  Transformation done clear
  D)
  Crossing over done clear
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• question_answer14)
  The scientists who have given the theory of linkage are [MP PMT 2001]
  A)
  Morgan and Castle done clear
  B)
  Beadle and Tatum done clear
  C)
  Watson and Crick done clear
  D)
  Bateson and Punnet done clear
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• question_answer15)
  In maize chromosome number is 2n = 20. The number of linkage groups in it shall be
  A)
  20 done clear
  B)
  40 done clear
  C)
  10 done clear
  D)
  5 done clear
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• question_answer16)
  The word 'crossing over' is given by
  A)
  Bateson done clear
  B)
  Darlington done clear
  C)
  Morgan done clear
  D)
  Muller done clear
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• question_answer17)
  Linkage decreases the frequency of [CPMT 1998]
  A)
  Hybrid done clear
  B)
  Dominant allele done clear
  C)
  Recessive allele done clear
  D)
  Both (a) and (b) done clear
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• question_answer18)
  Crossing over in diploid organism is responsible for [CBSE PMT 1998]
  A)
  Dominance of genes done clear
  B)
  Linkage between genes done clear
  C)
  Segregation of alleles done clear
  D)
  Recombination of linked allele done clear
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• question_answer19)
  Distance between two linked genes upon a chromosome is measured in cross over units, is [AIIMS 1998]
  A)
  Ratio of crossing over between them done clear
  B)
  Cross-over value done clear
  C)
  Number of other genes between them done clear
  D)
  None of these done clear
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• question_answer20)
  Linkage was first observed in [AFMC 2000]
  A)
  Field pea done clear
  B)
  Sweet pea done clear
  C)
  Pea done clear
  D)
  Grass pea done clear
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• question_answer21)
  What is the unit of crossing over
  A)
  Cistron done clear
  B)
  Muton done clear
  C)
  Recon done clear
  D)
  None of the above done clear
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• question_answer22)
  Crossing over that results in genetic recombination in higher organisms occurs between [CBSE PMT 2004, DPMT 2004, BVP 2004]
  A)
  Two daughter nuclei done clear
  B)
  Two different bivalents done clear
  C)
  Sister chromatids of a bivalent done clear
  D)
  Non-sister chromatids of a bivalent done clear
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• question_answer23)
  When closely placed genes on the same chromosome are inherited together the phenomenon is known as [Kerala PMT 2004]
  A)
  Qualitative inheritance done clear
  B)
  Crossing over done clear
  C)
  Gene interaction done clear
  D)
  Multiple allelism done clear
  E)
  Linkage done clear
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• question_answer24)
  In order to calculate map distance of genes on a chromosome, one must know the
  A)
  Number of mutant genes done clear
  B)
  Recombination frequency of each gene locus done clear
  C)
  Cross over percentage done clear
  D)
  Non-cross over percentage done clear
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• question_answer25)
  Number of linkage group in Pisum sativum is [BVP 2004]
  A)
  2 done clear
  B)
  5 done clear
  C)
  7 done clear
  D)
  9 done clear
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• question_answer26)
  Sexual reproduction leads to [CPMT 2002]
  A)
  Genetic recombination done clear
  B)
  Polyploidy done clear
  C)
  Aneuploidy done clear
  D)
  Euploidy done clear
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• question_answer27)
  In the diplotene stage [DPMT 1993]
  A)
  Chromosomes are thin and long done clear
  B)
  Homologous chromosomes undergo crossing over and chiasmata are seen done clear
  C)
  Bivalents become very short and chaismata move towards ends of chromosomes done clear
  D)
  Chromosomes have reached poles done clear
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• question_answer28)
  For the preparation of genetic maps, the recombination frequencies between genes are additive over short distances but not over long distances due to [BHU 1994]
  A)
  Multiple cross overs done clear
  B)
  Lethal mutation done clear
  C)
  Epistasis done clear
  D)
  Synaptonemal complex done clear
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• question_answer29)
  Genetic recombination occur through [CPMT 2002]
  A)
  Mitosis and fertilization done clear
  B)
  Mitosis and meiosis done clear
  C)
  Meiosis and fertilization done clear
  D)
  None of the above done clear
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• question_answer30)
  When synapsis is complete all along the chromosome, the cell is said to have entered a stage called [AIIMS 2005]
  A)
  Zygotene done clear
  B)
  Pachytene done clear
  C)
  Diplotene done clear
  D)
  Diakinesis done clear
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• question_answer31)
  What will be the number of linkage groups in maize if it has 10 pairs of chromosomes [MP PMT 1999; DPMT 1980]
  A)
  5 done clear
  B)
  10 done clear
  C)
  Zero done clear
  D)
  20 done clear
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• question_answer32)
  Linked gene are separated by [CPMT 1994]
  A)
  Crossing over done clear
  B)
  Mutation done clear
  C)
  (a) and (b) both done clear
  D)
  None of these done clear
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• question_answer33)
  Chiasma shows the sites of [MHCET 2003]
  A)
  Spindle formation done clear
  B)
  Synapsis done clear
  C)
  Crossing over done clear
  D)
  None of these done clear
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• question_answer34)
  The four daughter cells derived from a single meiosis differ from each other due to [BHU 1994]
  A)
  Difference in chromosome number done clear
  B)
  Crossing over only done clear
  C)
  Independent assortment of chromosomes only done clear
  D)
  Crossing over as well as independent assortment of chromosomes done clear
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• question_answer35)
  Crossing over causes [CBSE PMT 1991]
  A)
  Expression of recessive genes done clear
  B)
  Synapsis between homologous chromosomes done clear
  C)
  Recombination between linked genes done clear
  D)
  Linkage between dominant genes done clear
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