School / IB / BIOLOGY HL / Theme A: Unity and diversity (HL) Exam-style + marking analysis
Theme A: Unity and diversity (HL) HL-only depth on nucleic acid structure and the mechanisms and evidence behind speciation.
6 activities ≈ 14 minutes
Biology HL Theme A: Unity and diversity (HL)
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1 Distinguish between the structure of DNA and RNA in terms of their sugar, bases and number of strands. ✓ Reviewed Easy 3 marks No calculator + 2 Marking analysis: A learner attempts the following task: “Distinguish between the structure of DNA and RNA in terms of their sugar, bases and number of strands.” Their response addresses only this point: “States that DNA contains deoxyribose sugar, while RNA contains ribose sugar.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. ✓ Reviewed Marking analysis Easy 3 marks No calculator + 3 Outline how natural selection can lead to allopatric speciation. ✓ Reviewed Medium 4 marks No calculator + 4 Marking analysis: A learner attempts the following task: “Outline how natural selection can lead to allopatric speciation.” Their response addresses only this point: “States that a geographic barrier (e.g. a river, mountain range or ocean) physically separates a population into two subpopulations, preventing gene flow between them.” Evaluate the response against the complete 4-mark task. Identify what earns credit and state every additional requirement needed for full marks. ✓ Reviewed Marking analysis Medium 4 marks No calculator + 5 Outline the evidence from selective breeding (artificial selection) that supports the theory of evolution by natural selection. ✓ Reviewed Easy 3 marks No calculator + 6 Marking analysis: A learner attempts the following task: “Outline the evidence from selective breeding (artificial selection) that supports the theory of evolution by natural selection.” Their response addresses only this point: “States that selective breeding of domesticated species (e.g. dog breeds, or crop varieties) has produced significant, heritable phenotypic change from a common ancestral population within a relatively short, observable time frame.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. ✓ Reviewed Marking analysis Easy 3 marks No calculator + Self-assessed 0 / 0
Set total 20
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