Data Table: Dominant Hand = Non dominant Hand D = ND – Beak # of # of # of # of # of # of # of # of Types worms worms bugs bugs fruits fruits seeds seeds (D) (ND) (D) (ND) (D) (ND) (D) (ND) Clamps Bobby Pins Plastic Spoons Popsicle Sticks Analysis and Conclusion: (Use a separate piece of paper to answer the following questions) What bird or birds seemed best adapted to: /4 Eat worms Eat fruits Eat seeds Eat bugs How did variations in bird beak types affect survival of the birds? /3 In this lab, what is the selective pressure? (What caused the adaptations to /3 How is this lab an example of evolution by natural selection? /3 How does this lab relate to practiced and non practiced adaptations? /3 – How might the results of this activity change if you tried using each bird’s beak for more than thirty seconds and how would doing that relate to natural selection? /4 Suppose a drought caused the local extinction of all worms, fruits and seeds. This allowed the drought resistant to grow in their absence, which lives 12 centimetres – “bug” underground. Using your knowledge of the steps of natural selection and beak variations used in this lab, explain how the change in the environment would affect the populations of birds. /5
Data Table: D = Dominant Hand ND = Non – dominant Hand Beak Types # of worms (D) # of worms (ND) # of bugs (D) # of bugs (ND) # of fruits (D) # of fruits (ND) # of seeds (D) # of seeds (ND) Clamps Bobby Pins Plastic Spoons Popsicle Sticks Analysis and Conclusion: (Use a separate piece of paper to answer the following questions) What bird or birds seemed best adapted to: /4 Eat worms Eat fruits Eat seeds Eat bugs How did variations in bird beak types affect survival of the birds? /3 In this lab, what is the selective pressure? (What caused the adaptations to /3 How is this lab an example of evolution by natural selection? /3 How does this lab relate to practiced and non – practiced adaptations? /3 How might the results of this activity change if you tried using each bird’s beak for more than thirty seconds and how would doing that relate to natural selection? /4 Suppose a drought caused the local extinction of all worms, fruits and seeds. This allowed the drought – resistant “bug” to grow in their absence, which lives 12 centimetres underground. Using your knowledge of the steps of natural selection and beak variations used in this lab, explain how the change in the environment would affect the populations of birds. /5
bird_lab.docx