QCEVault

Continuity of life on Earth — Question 6

QCAA 2025, Paper 1 · 1 mark

Q6 · 2025 · Paper 1Unclassified1 mark

QUESTION 6

A student investigating the impact of a selection pressure on a population collected the data shown.

Genotype

BB

Bb

bb

Number of individuals

128

220

85

Calculate the frequency of the recessive allele in the population.

(A) 10%

(B) 20%

(C) 32%

(D) 45%

Question linkQCAA assessment resources

Related questions

  1. Q8 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 8 Speciation is more likely to occur between two populations when (A) gene flow is low and selection pressures are similar. (B) gene flow is high and selection pressures are similar. (C) gene flow is low and selection pressures are different. (D) gene flow is high and selection pressures are different.
    Continuity of life on Earth
  2. Q13 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 13 The cladogram shows relationships for species P, Q, R, S and T. P Q R S T hair amniotic egg four limbs backbone What inference can be drawn? (A) Species Q, R and S form a clade. (B) Species P and R are more closely related than species P and T. (C) The most recent common ancestor of species R and T had four limbs. (D) Species Q and R have a m…
    Continuity of life on Earth
  3. Q17 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 17 Which mode of evolution involves the development of complementary characteristics in two species experiencing a close and long-term interaction? (A) coevolution (B) parallel evolution (C) divergent evolution (D) convergent evolution
    Continuity of life on Earth
  4. Q25 · 2025 QCAA · Paper 1 · 5 marks
    QUESTION 25  (5 marks) Molecular sequence data from two proteins was used to determine the relatedness of giant pandas, red pandas, polar bears and ferrets. The graph shows the mutation rate of the two proteins used in the investigation. 100 Protein 1 Number of amino acid differences (per 100 residues) 90 80 70 60 50 Protein 2 40 30 20 10 0 0 10 20 30 40 50…
    Continuity of life on Earth