This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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 dont fit o Gametic isolation Gametes arent compatible More Barriers o Reduced hybrid viability -Zygotes dont 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...
View Full Document
- Fall '07