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ISC Class 12 Genetics and Evolution — practice questions — page 3

Explore 109 free Genetics and Evolution questions in ISC Class 12 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Genetics and Evolution questions and exercises with answers

Showing questions 61–90 of 109.

NEET · Biology · Molecular Basis of Inheritance · Operon ComponentRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Project to YearRead the answer and worked solution →During transcription, the enzyme that synthesises mRNA from DNA is:Read the answer and worked solution →DNA or RNA?Read the answer and worked solution →The central dogma of molecular biology states the flow of information asRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Punnett — Gap FillRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Tap True-Breeding CrossesRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Mendel Concept — MemoryRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Genotype RatioRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Dominant or Recessive — PeaRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Linkage and Crossing OverRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Pedigree SymbolRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Sex Determination TypeRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Type of InheritanceRead the answer and worked solution →A person with blood group AB has genotypeRead the answer and worked solution →The ABO blood-group system is an example ofRead the answer and worked solution →The phenotypic ratio in the F₂ of a Mendelian dihybrid cross (with two independently assorting genes) isRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Genetic Code PropertyRead the answer and worked solution →NEET · Biology · Homologous or AnalogousRead the answer and worked solution →NEET · Biology · Types of Natural SelectionRead the answer and worked solution →NEET · Biology · True or False — Evolution BasicsRead the answer and worked solution →The wings of insects and the wings of birds are best described as:Read the answer and worked solution →Genetic drift is STRONGEST in which type of population?Read the answer and worked solution →The mechanism of evolution proposed by Darwin isRead the answer and worked solution →Homo sapiens (modern humans) first evolved in:Read the answer and worked solution →The human APPENDIX is a classic example of a:Read the answer and worked solution →The shift in peppered moth (Biston betularia) colour during the Industrial Revolution is an example of:Read the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Tap Stop CodonsRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Replication DirectionRead the answer and worked solution →The Hershey-Chase experiment (1952) proved that:Read the answer and worked solution →

Worked practice questions

NEET · Biology · Molecular Basis of Inheritance · Operon Component

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Matching pairs
  1. Left
    Promoter
    Right
    RNA polymerase binding site
  2. Left
    Operator
    Right
    Repressor binding site
  3. Left
    Structural genes
    Right
    z, y, a (lac operon)
Instructions
Match each lac-operon part to its role.

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NEET · Biology · Molecular Basis of Inheritance · Project to Year

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Matching pairs
  1. Left
    Human Genome Project — start
    Right
    1990
  2. Left
    Human Genome Project — draft
    Right
    2001
  3. Left
    Watson-Crick double helix
    Right
    1953
Instructions
Match each milestone to the year.

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During transcription, the enzyme that synthesises mRNA from DNA is:

  1. DNA polymerase (replication)
  2. Ligase (seals nicks)
  3. Helicase (unzips DNA)
  4. RNA polymerase (transcription)
Show answer and solution

Correct answer: D. RNA polymerase (transcription)

RNA polymerase reads the DNA template 3'→5' and synthesises mRNA 5'→3'. DNA polymerase is for DNA replication helicase unzips; ligase joins Okazaki fragments.

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