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Unformatted text preview: NS Speciation and Diversity 06/11/2007 08:59:00 ← Biological species concept – species form through reproductive isolation • Individuals are the same species IF they have the potential to breed • This concept is meaningless in the cases of: o Fossils o Asexual reproducing organisms • Important thing in defining a species is reproductive isolation o Habitat isolation Live in the same area o Temporal isolation Reproduce at different times o Behavioral isolation Not attracted to one another • Barriers for fertilization o Mechanical isolation “Parts don’t fit” o Gametic isolation Gametes aren’t compatible • More Barriers o Reduced hybrid viability -Zygotes don’t develop o Reduced hybrid fertility - Offspring are sterile o Hybrid breakdown - Offspring are weak ← How to maintain reproductive isolation? Barriers to mating: • Premating o Geographic o COURSE INFO •...
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- Fall '07
- Evolution, Temporal isolation Reproduce, Habitat isolation Live