Presentation on theme: "No RP today. Have your pencil ready and be in your seat when the bell rings."— Presentation transcript:
1 No RP today.Have your pencil ready and be in your seat when the bell rings.
2 Today in Science ! ! !Begin EvolutionStandards please
3 S7L5 Students will examine the evolution of living organisms through inherited characteristics that promote survival of organisms and the survival of successive generations of their offspring.S7L5.a Explain how physical characteristics of organisms have changed over successive generations (e.g. Darwin’s finches and the peppered moths of Manchester).S7L5.b Describe ways in which species on earth have evolved due to natural selection.S7L5.c Explain how the fossil record found in sedimentaryrock provides evidence for the long history of changinglife forms.Meet Darwin
4 Notebooks due tomorrow ! New T o CLate grades:Disease FoldableNotebooks due tomorrow !
6 Evidence for Evolution In 1831 Charles Darwin traveled around the world. In the Galapagos Islands he observed a great variety of organisms like finches p.175, tortoises and iguanas.
7 Who was Charles Darwin?Darwin had begun to think that species could evolve over time. It became clear to Darwin that Earth was much older than anyone had imagined.What Is a Species? A species is a group of organisms that can mate with one another to produce fertile offspring. A characteristic that helps an organism survive and reproduce in its environment is called an adaptation.3rd stopped here
8 2. The evidence Darwin collected led him to theorize that living things change over time or evolve.
9 3. Current evidence for evolution: (6) and (5) Fossil record. Oldest fossils buried deeper Horses evolved from a dog sized animal 60 mya
10 B. Phylogeny – the evolutionary history tells which species evolved from other species or had common ancestors.2nd stopped here
13 4. How do we know the phylogeny – the history of how different organisms evolved? Phylogeny is determined . . .Similar body structures p. 172 G 168`Similar embryonic development Glencoe 169Similar DNA codesVestigial structures
17 d. Vestigial structures Some species have structures that they do not need. For example,humans ~ appendixwhales ~ tiny hip bones that whales donot need may have been inheritedfrom their walking ancestors.1st stopped here
23 Natural Selection Big Five Facts ~ Overproduction: This refers to the way many species produce waaaay more offspring than can possibly survive.Video clip 12:45What type of reproduction?What is that called when the baby looks so different from the mom? Process of change?
24 2. Variation (differences) exist among individuals in a species