IB DP Biology Higher Level (2023 syllabus) · IB ib-bio-hl
D Continuity and change
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Continuity and change
- Explain how the spindle apparatus ensures that each daughter cell receives a complete set … (4 marks, Explain)
- Explain how increasing global temperatures can alter the geographical distribution of terr… (4 marks, Explain)
- Explain how a bottleneck event can alter allele frequencies in a population and affect its… (4 marks, Explain)
- Explain how genetic drift can lead to rapid evolutionary change in small, isolated populat… (4 marks, Explain)
- Explain why individuals with greater reproductive success are more likely to pass on their… (4 marks, Explain)
- Explain why natural selection acts on phenotype rather than genotype, and outline the cons… (4 marks, Explain)
- Explain how the body maintains blood glucose concentration within its normal range followi… (4 marks, Explain)
- Explain how the renin–angiotensin–aldosterone system (RAAS) maintains blood pressure homeo… (4 marks, Explain)
- Explain how the process of meiosis contributes to genetic variation in sexually reproducin… (4 marks, Explain)
- Explain how water potential gradients drive the movement of water from the soil into the x… (4 marks, Explain)
- Explain how small interfering RNA (siRNA) molecules silence gene expression in eukaryotic … (4 marks, Explain)
- Explain the role of cohesins and the spindle checkpoint in ensuring accurate chromosome se… (4 marks, Explain)
- Explain how base substitution mutations can have varying effects on the phenotype of an or… (4 marks, Explain)
- Explain how the wobble hypothesis accounts for the fact that the number of tRNA molecules … (4 marks, Explain)
- Explain the roles of helicase and DNA gyrase (topoisomerase II) in preparing the DNA doubl… (4 marks, Explain)
- Explain how the antiparallel nature of DNA strands presents a challenge during replication… (4 marks, Explain)
- Explain why DNA replication is described as semi-conservative and outline the significance… (4 marks, Explain)
- Explain why some mutations that occur in somatic cells are not inherited by offspring, whe… (4 marks, Explain)
- Explain the molecular events that occur at the ribosome during the elongation stage of tra… (4 marks, Explain)
- Explain why the phenotypic ratio observed in the offspring of a dihybrid testcross may dev… (4 marks, Explain)
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