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Multiple Choice
Which two characteristics played a key role in reproductively isolating ground finches during their evolution in the Galápagos Islands?
A
Wing length and migration pattern
B
Diet preference and lifespan
C
Feather color and nest location
D
Beak size and mating song
Verified step by step guidance
1
Understand the concept of reproductive isolation: Reproductive isolation occurs when populations of the same species are prevented from interbreeding due to physical, behavioral, or ecological barriers. This leads to the formation of new species over time.
Recognize the importance of beak size: In the Galápagos Islands, ground finches evolved different beak sizes to adapt to specific food sources. This adaptation reduced competition and created ecological niches, contributing to reproductive isolation.
Understand the role of mating songs: Mating songs are unique to each finch population and are used to attract mates. Differences in mating songs act as a behavioral barrier, preventing interbreeding between populations with distinct songs.
Analyze why other options are incorrect: Wing length and migration pattern, diet preference and lifespan, and feather color and nest location do not directly contribute to reproductive isolation in ground finches. These traits are less relevant to the mechanisms that prevent interbreeding.
Conclude that beak size and mating song are the key characteristics: These traits played a critical role in the evolution of ground finches by creating ecological and behavioral barriers, leading to reproductive isolation and speciation.