When the Galapagos Islands were surveyed by Darwin, he noted 13 species of finches. Later he published the proposal that: too many species of finches overcrowded the islands finches probably evolved from one ancestral South American species the 13 finch species were identical to those he observed in northwestern South America 600 miles to the east finches evolved wings adapted for flying between specific islands all finches adapted to the same food sources

When the Galapagos Islands were surveyed by Darwin, he noted 13 species of finches. Later he published the proposal that: too many species of finches overcrowded the islands finches probably evolved from one ancestral South American species the 13 finch species were identical to those he observed in northwestern South America 600 miles to the east finches evolved wings adapted for flying between specific islands all finches adapted to the same food sources

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 20CTQ: Two species of fish had recently undergone sympatric speciation. The males of each species had a...

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Two species of fish had recently undergone sympatric speciation. The males of each species had a different coloring through which females could identify and choose a partner from her own species. After some time, pollution made the lake so cloudy it was hard for females to distinguish colors. What might take place in this situation?
Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches? Responses A The finches had different traits that influenced the environment in which they chose to live. The finches had different traits that influenced the environment in which they chose to live. - no response given B The finches evolved traits to help them survive in different environments. The finches evolved traits to help them survive in different environments. - no response given C Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed. - no response given D Genetic…
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The above image shows four different finches that Charles Darwin found while on the Galapagos Islands. This information led Darwin to develop the idea that organisms change, or evolve, over time. Which of these would best describe what Darwin saw as the MAJOR difference(s) between these finches? A) They all ate different food B) They all lived in different areas C) Both where they lived and what they ate were different D) Only their beak size was different and they lived together and ate the same food. Not Graded
One of Darwin’s finches, the medium ground finch (Geospiza fortis), is found on the small island of Daphne Major. These finches are seedeating birds. A major drought occurred on the island in 1977. Following the drought, the average beak size of medium ground finches had increased about 3%–4%. Why might a drought lead to an evolutionary change in beak size? Propose a hypothesis and explain how you could go about testing it.
Scientists have long believed that the 14 species of finches on the Galapagos Islands evolved from a single species of finch that migrated to the islands one to five million years ago. Recent DNA analyses support the conclusion that all of the Galapagos finches evolved from the mainland warbler finch. Different species live on different islands. One of the major changes in the finches is in their beak sizes and shapes. How would an evolutionary biologist today best answer the following question? How did the different beak types first arise in the Galapagos finches? A. Changes in the finches' beaks occurred by chance, and when there was a good match between beak structures and available food, those birds had more offspring. B. The changes in the finches' beaks occurred because the environment induced the desired genetic changes. C. The finches' beaks changed a little bit in size and shape with each successive generation, some getting larger and some getting…
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