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IB Biology HL A3.2 Classification and Cladistics Hl Only Questions

Practise using taxonomy, cladograms, molecular evidence and molecular clocks to infer evolutionary relationships and classification.

Exam points

explain why classification should reflect shared ancestry and can change when new evidence appears
interpret roots, nodes and branches to identify common ancestors and relative relatedness
use DNA or amino-acid differences and substitution data to construct or evaluate cladograms
compare Archaea, Eubacteria and Eukarya using rRNA, histones, cell walls and membrane lipids

Covered syllabus points

A3.2.1 (HL)—Need for classification A3.2.2 (HL)—Difficulties with traditional hierarchy A3.2.3 (HL)—Advantages of evolutionary classification A3.2.4 (HL)—Clades A3.2.5 (HL)—Molecular clock A3.2.6 (HL)—Constructing cladograms A3.2.7 (HL)—Analysing cladograms A3.2.8 (HL)—Testing classification correspondence A3.2.9 (HL)—Three domains classification

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Study A3.2 Classification and cladistics [HL only] conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 1]

Which is the hierarchy of taxa in order of increasing numbers of species?

A

genus, family, order, class

B

class, order, genus, family

C

genus, family, class, order

D

class, order, family, genus

[Maximum number: 8]

Evolution is the change in the heritable characteristics of a population.

Explain how evolutionary relationships and cladograms can be used for classification.

[Maximum number: 1]

Define clade.

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