QCEVault

Genetics and heredity — Question 15

QCAA 2022, Paper 1 · 1 mark

Q15 · 2022 · Paper 1Unclassified1 mark

QUESTION 15

The environment’s influence on gene expression can be investigated by comparing the rate of concordance in monozygotic (identical) and dizygotic (non-identical) twins. Concordance occurs when both twins express a trait. Strong environmental influence is suspected when concordance is

(A) higher in monozygotic twins.

(B) only observed in dizygotic twins.

(C) only observed in monozygotic twins.

(D) similar in monozygotic and dizygotic twins.

Question linkQCAA assessment resources

Related questions

  1. Q1 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 1 Which base pairs with adenine during DNA replication? (A) uracil (B) guanine (C) thymine (D) cytosine
    Genetics and heredity
  2. Q4 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 4 What is the role of tRNA in protein synthesis? (A) acting as a template strand for mRNA (B) matching amino acids to mRNA codons (C) transporting mRNA from the nucleus to the ribosome (D) providing a copy of genetic instructions for the ribosome
    Genetics and heredity
  3. Q5 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 5 Which option describes the contents of a human cell at metaphase I of meiosis? Number of chromosomes Number of copies of each gene (A) 23 1 (B) 23 2 (C) 46 2 (D) 46 4
    Genetics and heredity
  4. Q10 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 10 In humans, sex-linked recessive traits are more common in (A) males, because they have a Y chromosome. (B) females, because they have two X chromosomes. (C) males, because they have only one X chromosome. (D) females, because they do not have a Y chromosome.
    Genetics and heredity