Evolution. 3/27/12. Objective: Introduce origins theories Do Now: Hand in popular science questions Do Later: Read sections 13.1-3. Diversity of life. Estimated 10 million species on earth Phylogenetic trees show relationships. Origins Theories. Lamarck Spontaneous generation
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Mules are the offspring of a male donkey and a female horse. They are sterile.
Zebra + horse zebroid (sterile)
Tiglons can occasionally reproduce with difficulty.
Why do all marsupials live in Australia?
Archaeopteryx – between dinosaurs and aves (birds)
Basilosaurus – intermediate between land mammals and whales
Red = pesticide resistant
White = wild type (‘normal’)
The fungus Beauveriabassianais toxic to many beetles but non-toxic to humans
Diversifying crops can limit the spread of pests
Stabilizing selection regulates birth weight
Where do new traits come from?
Ribosomes contain RNA to help catalyze protein synthesis