Homologous Structures Worksheet
Explore homologous structures, their evolutionary significance, and how they provide evidence for common ancestry in this Grade 12 Biology worksheet.
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Homologous Structures Worksheet
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Read each question carefully and answer to the best of your ability. Refer to your knowledge of homologous structures and evolutionary biology.
1. Which of the following best defines homologous structures?
Structures that have similar functions but different origins.
Structures that have different functions but similar underlying anatomical positions and embryonic origins.
Structures that are superficially similar due to convergent evolution.
Structures that have lost their original function over time.
2. The forelimbs of a human, a cat, a whale, and a bat are examples of homologous structures. What does this suggest about these organisms?
They evolved in similar environments.
They share a common ancestor.
They have identical genetic makeup.
They all perform the same function.
1. Homologous structures are evidence of evolution, where species diverge from a common ancestor.
2. In contrast to homologous structures, analogous structures arise from evolution, where unrelated species develop similar traits due to similar environmental pressures.
1. The wings of a bat and the wings of a butterfly are homologous structures.
True
False
2. The presence of homologous structures implies a shared developmental pathway.
True
False
1. Explain how homologous structures provide strong evidence for the theory of evolution.
Observe the image below, which illustrates the forelimbs of several different animals. Identify and label the homologous bones in each structure.
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