IB Biology HL A3.2 Classification and cladistics questions

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Question 1

Paper 2Easy5 marks

A botanical team reviewed a classification in which flowering plant species A and B were grouped together because their flowers have a similar shape. The team compared the same 12-base region of DNA in the three species.

Species pairNumber of base differences
A and B12
A and C2
B and C10
(a)

Identify the pair with the most similar DNA sequences.

[1]
(b)

Does the DNA evidence support classifying A and B as the closest relatives among these three species? Justify your answer using one comparison from the table.

[2]
(c)

Suggest why classification based on flower shape could have been misleading.

[2]

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