IB Biology HL D4.1.6 Traits Must Be Heritable Topic Practice

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Study D4.1.6—Traits must be heritable conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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 1 — IB Biology HL

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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