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DP IB Biology: SL

Topic Questions

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

Which of the following statements about genomes is not correct? 

  • Humans have around 20 000 genes

  • Species vary in the number of genes they have

  • The number of genes of an organism is not proportional to genome size

  • Humans have the most genes of any organism

Choose your answer
  

Question 2

Marks: 1

Which option correctly completes the sentence below?

Multiple alleles are present _________.

  • At the same locus on homologous chromosomes

  • At different loci on different chromosomes

  • At different loci on the same chromosome

  • On sister chromatids

Choose your answer
  
Key Concepts
Loci
Alleles

Question 3

Marks: 1

Which of the following statements, correctly describes the impact of the substitution mutation shown below?

Y623Ljwi_e-3

  • The codon encoding an amino acid was changed to a stop codon, truncating the polypeptide

  • The sequence of amino acids may code for a different protein structure

  • The resulting polypeptide chain will be elongated

  • There will be no change in the polypeptide chain

Choose your answer
  
Key Concepts
Mutation

Question 4

Marks: 1

Which row correctly describes the features of prokaryotic chromosomal DNA?

A. Associated with histone proteins Circular
B. Not associated with histone proteins Linear
C. Not associated with histone proteins Circular
D. Contains a few hundred genes  Circular
    Choose your answer
      

    Question 5

    Marks: 1

    Which of the individuals below is represented by the following karyogram?

    fPz8KBpJ_e-5

    • A male with a chromosomal abnormality

    • A genetically normal female

    • A male with Down syndrome

    • A female with Down syndrome

    Choose your answer