9) The evolution of tremendous diversity of ciclid fish in the Great Lakes of East Africa has been described as following two possible models of speciation. Which of the following combinations have been connected with the rapid radiation observed in this system: d) Sympatric and Allopatric speciation 10) “Darwin’s finches” are a diverse group of co-occurring species of Geospiza that evolved within the last 2-3 million years from a common ancestor and show large differences in their beak shape and size. What has been shown to drive the differences in this trait? b) Differences in the food resources that they specialize upon, particularly during periods of drought Birds with small beaks suffered selective mortality during a severe drought. The members of the medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to directional natural selection in the next generation as beak size variaiton is greatly heritable. b) Differences in the food resources that they specialize upon, particularly during periods of drought Birds with small beaks suffered selective mortality during a severe drought. The members of the medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to directional natural selection in the next generation as beak size variaiton is greatly heritable. Solution 9) The evolution of tremendous diversity of ciclid fish in the Great Lakes of East Africa has been described as following two possible models of speciation. Which of the following combinations have been connected with the rapid radiation observed in this system: d) Sympatric and Allopatric speciation 10) “Darwin’s finches” are a diverse group of co-occurring species of Geospiza that evolved within the last 2-3 million years from a common ancestor and show large differences in their beak shape and size. What has been shown to drive the differences in this trait? b) Differences in the food resources that they specialize upon, particularly during periods of drought Birds with small beaks suffered selective mortality during a severe drought. The members of the medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to directional natural selection in the next generation as beak size variaiton is greatly heritable. b) Differences in the food resources that they specialize upon, particularly during periods of drought Birds with small beaks suffered selective mortality during a severe drought. The members of the medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks lacked the strength to crack the large seeds and died at a higher rate than large birds. This led .

1. 9) The evolution of tremendous diversity of ciclid fish in the Great Lakes of East Africa has been
described as following two possible models of speciation. Which of the following combinations
have been connected with the rapid radiation observed in this system:
d) Sympatric and Allopatric speciation
10) “Darwin’s finches” are a diverse group of co-occurring species of Geospiza that evolved
within the last 2-3 million years from a common ancestor and show large differences in their
beak shape and size. What has been shown to drive the differences in this trait?
b) Differences in the food resources that they specialize upon, particularly during periods of
drought
Birds with small beaks suffered selective mortality during a severe drought. The members of the
medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks
lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to
directional natural selection in the next generation as beak size variaiton is greatly heritable.
b) Differences in the food resources that they specialize upon, particularly during periods of
drought
Birds with small beaks suffered selective mortality during a severe drought. The members of the
medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks
lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to
directional natural selection in the next generation as beak size variaiton is greatly heritable.
Solution
9) The evolution of tremendous diversity of ciclid fish in the Great Lakes of East Africa has been
described as following two possible models of speciation. Which of the following combinations
have been connected with the rapid radiation observed in this system:
d) Sympatric and Allopatric speciation
10) “Darwin’s finches” are a diverse group of co-occurring species of Geospiza that evolved
within the last 2-3 million years from a common ancestor and show large differences in their
beak shape and size. What has been shown to drive the differences in this trait?
b) Differences in the food resources that they specialize upon, particularly during periods of
drought
Birds with small beaks suffered selective mortality during a severe drought. The members of the
medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks
lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to
directional natural selection in the next generation as beak size variaiton is greatly heritable.

2. b) Differences in the food resources that they specialize upon, particularly during periods of
drought
Birds with small beaks suffered selective mortality during a severe drought. The members of the
medium ground finch survived on a diest of large and hard seeds. Birds with smaller beaks
lacked the strength to crack the large seeds and died at a higher rate than large birds. This led to
directional natural selection in the next generation as beak size variaiton is greatly heritable.