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DP IB Biology: SL

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Home / IB / Biology: SL / DP / Topic Questions / 3. Genetics / 3.1 Genes & Chromosomes / Multiple Choice: Paper 1


3.1 Genes & Chromosomes

Question 1

Marks: 1

The nucleotide base sequence and the associated sequence of four amino acids can be seen below:

AGG   ACA   CCT   GGA

Serine   Tyrosine   Glycine   Proline

The table shows the mRNA codons and their associated amino acids.

h-1

A single mutation occurred in the original base sequence of the DNA which resulted in only one amino acid from the sequence being produced.

Which of the following would represent the correct nucleotide base sequence which was found in the DNA after the mutation occurred?

  • AGT   ACA   CCT   GGA

  • AGG   ACT   CCT   GGA

  • AGG   ACC   CCT   GGA

  • AGG   ACA   UGA   GGA

Choose your answer
  
Key Concepts
Mutation
Codons

Question 2

Marks: 1

A group of scientists were working on a project to sequence the DNA of an endangered species of gorilla in order to deduce the nucleotide base sequence of a specific gene of interest.

What is the correct process that the scientists may have followed in order to sequence this specific gene from a sample of DNA extracted from a gorilla?

A. HindIII is added to the sample to cut the DNA on either side of the gene of interest The double stranded fragments are separated into single strands Single stranded copies are made using fluorescently labelled nucleotide bases (A, T, C, G) Capillary electrophoresis is used to separate the DNA by size
B. A restriction enzyme is added to the sample to cut the DNA on either side of the gene of interest  The double stranded fragments are copied using DNA polymerase Single stranded copies are made using fluorescently labelled nucleotide bases (A, T, C, G) Gel electrophoresis is used to separate the DNA by charge
C. HindIII is added to the sample to cut the DNA on either side of the gene of interest The double stranded fragments are separated into single strands Single stranded copies are made using fluorescently labelled nucleotide bases (A, U, C, G) Capillary electrophoresis is used to separate the DNA by charge
D.  A restriction enzyme is added to the sample to cut the DNA on either side of the gene of interest  Ligase enzyme is used to attach a promotor region to the start of the gene sequence Single stranded copies are made using fluorescently labelled nucleotide bases (A, U, C, G) Capillary electrophoresis is used to separate the DNA by size
    Choose your answer
      

    Question 3

    Marks: 1

    The two karyotypes belong to a donkey (Q) and a horse (R).

    h-31

    Breeding these two individuals resulted in the production of a sterile mule (S).

    Why would S be sterile?

    • The sex of the mule (S) will be undetermined at birth due to the unnatural combination of chromosomes

    • Different combinations of alleles formed as a result of crossbreeding Q and R which leads to disadvantageous characteristics in S

    • There are different numbers of chromosomes in the gametes of Q and R so S would not live long enough to breed

    • The process of meiosis will not be possible in S as homologous pairs cannot form

    Choose your answer
      

    Question 4

    Marks: 1

    Which of the following statements are true for the determination of sex?

    1. The chromosomes inherited through the maternal gametes determine the sex of the offspring
    2. Females have a larger quantity of DNA than males
    3. Sex is determined by the 23rd pair of chromosomes in humans
    4. Sex of an individual can be identified using an image taken of chromosomes during interphase
    • I and II only

    • III only

    • II and III only

    • I, III and IV only

    Choose your answer
      
    Key Concepts
    Sex Determination

    Question 5

    Marks: 1

    Cytochrome C is a protein which is common to all organisms and is therefore a useful gene sequence to study when constructing phylogenetic trees to represent evolutionary relationships.

    The table shows the number of nucleotide differences in the cytochrome C genes of several different species.

    nucleotide-base-comparisons-mcq

    Which of the following shows the correct order of the organisms if arranged from the most closely related to the least closely related compared to humans?

      1. Human
      2. Chicken
      3. Fruit fly
      4. Yeast
      5. Mouse
      6. Rat
      1. Human
      2. Rat
      3. Mouse
      4. Fruit fly
      5. Yeast
      6. Chicken
      1. Human
      2. Mouse
      3. Rat
      4. Chicken
      5. Fruit fly
      6. Yeast
      1. Human
      2. Yeast
      3. Fruit fly
      4. Chicken
      5. Rat
      6. Mouse
    Choose your answer