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ISC Class 12 Genetics and Evolution — practice questions — page 2

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 31–60 of 109.

NEET · Biology · Molecular Basis of Inheritance · Transcription Component — MemoryRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Splicing Term — Gap FillRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Replication Fork — Gap FillRead the answer and worked solution →Charles Darwin's mechanism of evolution is best described as:Read the answer and worked solution →NEET · Bio · Principles of Inheritance · Chromosome Pair CountRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Hardy-Weinberg — Gap FillRead the answer and worked solution →In a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:Read the answer and worked solution →Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:Read the answer and worked solution →Mendel conducted his classic genetics experiments using:Read the answer and worked solution →A trait controlled by three or more genes whose effects add up, producing a continuous range of phenotypes, is calledRead the answer and worked solution →Sickle cell anaemia is caused by:Read the answer and worked solution →If two genes on the same chromosome show a recombination frequency of 1%, they are approximatelyRead the answer and worked solution →In humans, the sex of a child is determined at fertilisation byRead the answer and worked solution →In the human ABO blood group system, a person with blood group AB has the genotype:Read the answer and worked solution →Match each disorder to its chromosomal / genetic cause.Read the answer and worked solution →In Mendel's monohybrid cross of tall × dwarf pea plants, the phenotypic ratio in the F₂ generation wasRead the answer and worked solution →A tall pea plant is crossed with a dwarf plant. Half the offspring are tall and half are dwarf. The genotype of the tall parent must beRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Histone Octamer — Gap FillRead the answer and worked solution →The Meselson-Stahl experiment proved that DNA replication isRead the answer and worked solution →During transcription, the strand of DNA actually read by RNA polymerase isRead the answer and worked solution →Which eukaryotic RNA polymerase synthesises the mRNA precursor (hnRNA)?Read the answer and worked solution →Which of the following is the universal start codon?Read the answer and worked solution →Approximately how much of the human genome codes for proteins?Read the answer and worked solution →The Central Dogma of molecular biology states that genetic information flows:Read the answer and worked solution →Okazaki fragments are produced during DNA replication on which strand?Read the answer and worked solution →NEET · Bio · Principles of Inheritance · Mendel — TraceRead the answer and worked solution →Translation of mRNA into protein occurs on which cellular structure?Read the answer and worked solution →Introns are best described asRead the answer and worked solution →A nucleosome consists ofRead the answer and worked solution →Naming the processesRead the answer and worked solution →

Worked practice questions

NEET · Biology · Molecular Basis of Inheritance · Transcription Component — Memory

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Matching pairs
  1. A
    Promoter
    B
    Where polymerase binds first
  2. A
    Sigma factor
    B
    Helps polymerase find promoter
  3. A
    Template strand
    B
    Read 3' → 5'
  4. A
    Coding strand
    B
    Same sequence as mRNA (with U for T)
  5. A
    Terminator
    B
    Signals end of transcription
  6. A
    Rho factor
    B
    Helps terminate certain transcripts
Instructions
Flip cards to match each transcription component.

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NEET · Biology · Molecular Basis of Inheritance · Splicing Term — Gap Fill

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Missing parts
  1. Answer
    exons
    Choices
    1. introns
    2. exons
    3. operons
    4. anticodons
  2. Answer
    introns
    Choices
    1. introns
    2. exons
    3. operons
    4. anticodons
Complete the statement
Coding regions of pre-mRNA are called {0}; non-coding pieces removed during splicing are called {1}.
Instructions
Fill the splicing terms.

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NEET · Biology · Molecular Basis of Inheritance · Replication Fork — Gap Fill

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Missing parts
  1. Answer
    5' → 3'
    Choices
    1. 3' → 5'
    2. 5' → 3'
    3. either
    4. both
  2. Answer
    Okazaki
    Choices
    1. Watson
    2. Okazaki
    3. Crick
    4. Pribnow
Complete the statement
DNA polymerase only synthesises in the {0} direction. The lagging strand is made in short pieces called {1} fragments.
Instructions
Fill in two key replication facts.

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