Unformatted text preview: zygotic and post‐zygotic reproductive isolating mechanisms. 21. What are limitations of the biological species definition? Describe the other types of species definitions. 22. Describe the processes of allopatric & sympatric speciation, respectively. By what mechanisms can sympatric speciation occur? What is allopolyploidy? 23. What are hybrid zones? How do these form? What are the three possible outcomes of a hybrid zone? 24. In terms of macroevolution, describe how the three major influences that contributed to changing life on Earth: continental drift; mass extin...
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- Spring '08
- Darwin, Natural history, Sympatric speciation, Sadava text Ch, homologous features