If two species have similar proteins and genes it means:
Correct answer: C. They have common ancestors.
- A. They have the same organs.
- B. They have a similar appearance.
- C. They have common ancestors.
- D. All of the above.
Explanation
The correct answer is that they have common ancestors. Genetic and protein similarities are key indicators of evolutionary relationships, pointing to a shared lineage. This is based on the principle of homology, where traits inherited from a common ancestor are evident even if they appear different in form and function. The incorrect options fail to recognise that evolutionary history, not just physical traits or organ structures, explains genetic similarities.
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About Evolution
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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