"Larkeys and Natural Selection: Moving to a New Environment"
Bellwork:
1) New species evolve because of ___________, selective pressure, and isolation.
Hint: the word starts with a V
2) Why would one gene increase if an environment changed?
3) Draw the Punnett square for parents TT and Tt.
- "Voyage to the Galapagos": Examples of Natural Selection in action
1) Darwin's finches: they live on different islands, so different adaptations helped them survive - the surviving birds looked different in different environments, and they eventually got different enough to be different species
2) Marine iguanas: small size is an adaptation on islands with less food - if they were big, they'd starve to death; small iguanas survived and passed on genes for small size
3) Masked boobies: they kill their younger siblings; the second chick is a back-up in case the 1st doesn't hatch, and a surviving 1st chick will kill the 2nd chick to make sure he gets enough food
- Look at this site for a cyber field trip to the Galapagos Islands
- Larkey simulation: complete pages 119, 121, and 123 in the yellow workbook
Larkeys move from mountains to forests and prairies after a fire
We will carry out a simulation to see what happens in this new environment ==> complete Punnett squares to show 3 larkey generations and their traits
- Question: What happens to the larkey populations over time? Which traits are adaptations that help them survive, and which traits end up getting them eaten?
- Exit Slip (page 121)
1) Describe the change in larkey looks from the first generation to the last.
2) Explain why certain traits now appear more than others.
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