Unit 18 · Variation and Selection
Question Bank
Cambridge IGCSE Biology 0610 · 80 questions
Q79Variation and Selection
Why do antibiotic-resistant bacteria become more common?
(a)Antibiotics cause resistance mutations directly
(b)Resistant bacteria survive and reproduce while others die
(c)Bacteria learn to resist
(d)Resistant bacteria reproduce sexually
Correct answer: (b) Resistant bacteria survive and reproduce while others die
Explanation: Natural selection: only resistant bacteria survive treatment and pass on the allele.
Related lesson
18.3 SelectionVariation and Selection Tags