Biology Forum
Questions for group discussion:
- Tigers and lions inhabit different areas and different habitats. Tigers live in forested areas in South East Asia while Lions inhabit open savannas in Africa and South West Asia. Lions and tigers never mate in the wild because they are geographically and ecologically isolated. However, in the zoo, they can mate and produce viable offspring. A) Would you classify tigers and lions as the same species using the biological species concept? Yes/No and explain what was the main factor in your decision. B) Would you classify tigers and lions as the same species using the ecological species concept? Yes/No and explain what was the main factor in your decision.
Watch this interactive video to answer questions 2 & 3:
- According to the example of lizard speciation in the Caribbean (watch the video above). A) Identify cases of sympatric speciation. B) List and explain the evolutionary forces that resulted in this type of speciation (Natural selection, gene flow (migration), genetic drift, non-random mating, mutation). Base your answer on the video above.
- According to the example of lizard speciation in the Caribbean (watch the video above). A) Identify cases of allopatric speciation. B) List and explain the evolutionary forces that resulted in this type of speciation (Natural selection, gene flow (migration), genetic drift, non-random mating, mutation). C) Identify cases of convergent evolution and explain your choice. Base your answer on the video above.
Use this phylogeny for question 4:
- This phylogeny shows the relationships of all vertebrates. A) Where is the most recent common ancestor between mammals and reptiles? Explain your choice B) Both, birds and mammals have the ability to regulate body temperature using metabolism. This is called endothermy. Do you think endothermy is a homologous or analogous trait of birds and mammals? Explain your choice. C) Amphibians, reptiles and mammals are considered tetrapods because they all have four legs or descend from ancestors with four legs. Where do you think the trait for four legs first appeared? Explain. D) Can you use this phylogeny to argue that one group is more evolved than another? explain.
- Explain how DNA replication, mitosis and meiosis are involved in the appearance and transmission of heritable mutations.
- Explain how gene regulation and developmental genes are involved in the evolution of species.
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