Evidence of Evolution Part II What you should know for your Test III essay!

Theory of Evolution  All life on Earth descended from a common ancestor  Life originated as a simple form, and became more diverse and complex over time

Evidence in Organisms  “Evolution proceeds by modifications of organisms which already exist”

Evidence in Organisms I.Homologous Structures * Definition * Examples (Describe in detail!)

I. Homologous Structures 

Homologous Structures 

 Why evidence of evolution?

Evidence in Organisms II.Similarities in Embryonic Development All animals:  cleavage, morula, blastula, layering after blastula (gastrula)All animals:  cleavage, morula, blastula, layering after blastula (gastrula) All Vertebrates: What did you observe?All Vertebrates: What did you observe?  C-shape, big eyes, tails, gill slits, limb buds, etc.

Similarities in Embryonic Development How evidence of Evolution?

Evidence in Organisms III. Vestigial Structures definition:definition: Examples:Examples: How evidence of evolution?How evidence of evolution?

Evidence in Organisms  What evidence suggests that life forms today share a common ancestor?  Animal life: –Bone homology –Embryological comparisons  All life: –Biochemical evidence  DNA/Proteins  Energy reactions

II. Evidence in Organisms  Evidence that Life forms change over time  Vestigial Structures –Definition –Examples  Artificial Selection  Peppered Moth