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IB Biology SL D4.1.6 Traits Must Be Heritable Questions

Review why natural selection depends on heritable traits, and why characteristics acquired during life are not inherited through DNA base sequences.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify genetic variation and advantageous heritable traits as requirements for natural selection.
  • Distinguish heritable changes from characteristics acquired during an individual’s life, which are not passed to the next generation.

IB Biology SL D4.1.6 Traits Must Be Heritable Questions question 1

[Maximum number: 1]

A central idea in the theory of evolution is that species may evolve gradually over time from a common ancestor.

Figure for Question IB Biology SL D4.1.6 Traits Must Be Heritable Questions question 1 — IB Biology SL

Which statement(s) explain(s) the pattern of evolution seen in the diagram?

I. Beak shape shows genetic variability in the common ancestor.
II. Changes in beak shape that occur during the lifetime of an individual bird are passed on to the next generation.
III. Changes in beak shape are heritable and make each species better adapted to its environment.

A

II only

B

I and II only

C

I and III only

D

I, II and III

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