The 13 species of finches on the Galapagos Islands evolved from a single species that migrated to the islands several million years ago. Different finch species live on different islands. A major difference among finch species is in their beaks: both size and shape vary greatly. Assume that a population of one of these finch species is undergoing evolution by natural selection with respect to beak size and shape. What changes occur gradually over time that indicate the population is evolving? All finches in each new generation develop the same new, improved beak size and shape. Each finch's learned ability to use its beak is automatically passed on to its offspring. The proportions of finches having different beak sizes/shapes change across generations. Within their lifetimes, some individual finches' beaks change in size or shape.
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This process involves variation, inheritance, selection, and time. Individuals in a population vary in their traits, some of which are heritable. Those with advantageous traits are more likely to survive and reproduce, passing these traits to the next generation. Show more…
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The 14 species of finches on the Galapagos Islands evolved from a single species that migrated to the islands several million years ago. Different finch species live on different islands. A major difference among finch species is in their beaks: both size and shape vary greatly. Assume that a population of one of these finch species is undergoing evolution by natural selection with respect to beak size and shape. What changes occur gradually over time that indicate the population is evolving? Within their lifetimes, some individual finches' beaks change in size or shape. The proportions of finches having different beak sizes/shapes change across generations. Each finch's learned ability to use its beak is automatically passed on to its offspring. All finches in each new generation develop the same new, improved beak size and shape.
Dominador T.
Different finch species have beaks of different shapes and sizes. What do these beak differences tell us? Different finch species have beaks of different shapes and sizes. What do these beak differences tell us? Different finch beak shapes are evidence that individual birds changed their beaks so that they could feed efficiently. Different finch beak shapes are evidence that all Galápagos finches share a common ancestor. Different finch beak shapes are evidence that finch species adapted to different environments over many generations. Different finch beak shapes are evidence that several finch species with different beak types came to the Galápagos Islands from the mainland.
Madhur L.
Three Galapagos finch species have different beak sizes and specialize in different types of food. Explain how these three species can share the same habitat without driving each other to extinction.
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