What causes species to evolve over time? Essential Question: What causes species to evolve over time? Learning Target Provide evidence from several sources that all organisms have evolved from a common ancestor. Explain the four factors that result in the evolution of a species. Section 6-1: evolution
Critical Readings must be stamped and turned in by Friday (1/13/17). announcements Biology Tutoring this week: Lunch B (Tuesday & Thursday) 7:00AM (Monday – Friday) After school Biology Tutoring: Tuesday Critical Readings must be stamped and turned in by Friday (1/13/17).
announcements Available Extra Credit: Tissue Box = 2 Points 6.6oz bag of Goldfish (Pretzel/Cheddar) = 5 Points
Don’t forget to chunk your notes!
Charles Darwin was an English scientist. overview Charles Darwin was an English scientist.
Darwin traveled to the Galapagos Islands aboard the H.M.S. Beagle. overview Darwin traveled to the Galapagos Islands aboard the H.M.S. Beagle.
overview Book: “The Origin of Species” Darwin publishes his theory 25 years after his voyage on the Beagle.
Darwin observed the finches on _____ island. overview Galapagos Darwin observed the finches on _____ island.
The birds were similar, but they had different shaped _____ . overview The birds were similar, but they had different shaped _____ . beaks
Why are all of these different? These are all ___. They are all made by ___. Why are all of these different? sports Shoes/Nike Because different sports, played on different terrain and environments
These finches probably shared a common _______ . overview These finches probably shared a common _______ . ancestor
These finches probably shared a common ancestor. overview These finches probably shared a common ancestor.
Darwin collected fossils. Galapagos island Darwin collected fossils. Some fossils looked like organisms that were still alive. Others looked completely unlike any creature he had ever seen.
Size of a large football Extinct Glyptodon 11/13/2018 Size of a VW Beetle car Armadillo mm Size of a large football
11/13/2018 What does this mean? Common ancestor This means that they could have had a _______ _______ millions of years ago! mm
Galapagos island shell Darwin observed that tortoises from different islands had different ______ shapes.
Galapagos island Even though these tortoises are different, how come they have so many similarities? Common ancestry from before the geographic split
Evolution Darwin thought, “Maybe a long time ago the turtles living on different islands all belonged to the same species!” Common ancestor
These different species would have evolved from a common ancestor. evolution These different species would have evolved from a common ancestor.
These different species would have evolved from a common ancestor. evolution These different species would have evolved from a common ancestor.
Evolution = change over time ****It takes a long time to happen**** Millions of years Evolution = change over time ****It takes a long time to happen****
Evolution = change over time ****It takes a long time to happen**** Millions of years Evolution = change over time ****It takes a long time to happen****
Evolution Hutton and Lyell proposed that geological forces shaped the Earth over Millions of years. Pangea
Darwin proposed the theory of _______ ______ . Natural selection Natural selection Darwin proposed the theory of _______ ______ .
Natural selection The turtles on _______ Island probably had a common ______ . Then Pangea caused their evolution through _____ selection. Galapagos/ancestor/natural
Natural selection
Natural selection There are turtles that have necks that can eat food on low and high ground.
Turtles with long necks can reach for food. Natural selection Turtles with long necks can reach for food.
Turtles with short necks only eat food on the ground. Natural selection Turtles with short necks only eat food on the ground.
Do now activity #1 How come some islands only have turtles with long necks and others only have turtles with short necks? At least how many years did it take for these turtles to evolve?