Biology Mr. Galego Questions from Explaining Evolution: Speciation Defining a Species 1. What is the definition of a species? 2. What is a gene pool? 3. Why is defining a species often difficult in nature? Provide one example to support your answer. Defining Speciation 4. What is speciation? 5. Why did the fruit flies become separate species? Causes of Speciation 6. Explain how geographic isolation and reduction of gene flow could potentially produce new species. Reproductive Isolation 7. Explain the 3 barriers to gene flow that are described in this section and provide an example of each. 8. Which of the above barriers is present in the fruit flies example? Explain. Evidence for Speciation 8. Why could the iguanas on Anguilla eventually serve as an example of allopatric speciation?