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6.3 The development of understanding of genetics and evolution

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Question 9

Four fossils, K, L, M and N, were found in separately dated rocks.

FossilAge of rock / million yearsJawTeethLimb proportionsTail
K152narrowpointed onlyfront and hind limbs similar in lengthlong
L121narrowpointed and broad, flatfront and hind limbs similar in lengthlong
M83widebroad, flat onlyfront limbs shorter than hind limbslong
N47widebroad, flat onlyfront limbs shorter than hind limbsshort

A scientist proposes that the fossils form an evolutionary sequence from K to N. The scientist also claims that the type of animal represented by each fossil was directly ancestral to the type represented by the next fossil.

Evaluate the scientist's proposal and claim.

[4]
Markscheme

6.3 The development of understanding of genetics and evolution Questions

  1. GCSE
  2. /Biology
  3. /6.3 The development of understanding of genetics and evolution

71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.

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