Multiple Choice
Which type of isolating mechanism played a key role in the formation of different Galápagos finch species?
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1. Introduction to Biology
Natural Selection and Evolution
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An analogous structure found in two species is a structure that:
A
performs a similar function but evolved independently in each species
B
is present only in closely related species
C
has the same genetic origin but different functions
D
is inherited from a common ancestor and has a similar structure
Verified step by step guidance1
Understand the concept of analogous structures: Analogous structures are features in different species that perform similar functions but do not share a common evolutionary origin. They arise due to convergent evolution, where unrelated species adapt to similar environmental challenges.
Compare analogous structures to homologous structures: Homologous structures are inherited from a common ancestor and may have different functions but share a similar underlying structure and genetic origin. This distinction is key to answering the question.
Analyze the options provided: The correct answer should align with the definition of analogous structures, which emphasizes independent evolution and similar function rather than shared ancestry or genetic origin.
Eliminate incorrect options: For example, 'is inherited from a common ancestor and has a similar structure' describes homologous structures, not analogous ones. Similarly, 'has the same genetic origin but different functions' does not fit the definition of analogous structures.
Select the correct answer: Based on the definition and elimination process, the correct answer is 'performs a similar function but evolved independently in each species.' This matches the concept of analogous structures.
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