Evolution The Evidence You will be able to

Evolution: The Evidence You will be able to explain how fossils and homologous structures are used to show the evolution of a species

Evolution: The Evidence b Importance of fossils: b *Provides blue prints of organisms* b determine age of rock layer (law of superposition b tells environment of land then

Evolution: The Evidence b Fossils provide us with homologous structures b Homologous Structures are body parts from two different organisms which have a similar structure and design b Body Parts Contain same number of bones and muscle attachments.

Evolution: The Evidence b Homologous Structures: b Pectoral Fin-Whale Arm. Human Wing. Chicken b All basically have same basic design; much different uses however, (determined by environment)

Evolution: The Evidence b Evolution also supported by the study of Embryology b Embryology is the study of developing embryos b Scientists can see very diverse organisms as adults have very similar beginnings (p. 553)

Evolution: The Evidence b Human b tails b gill Embryos have slits (remnants) b share this trait with majority of all vertebrate organisms b shows possible link to an aquatic ancestor (fish? ? ) b Eventually traits disappear EXCEPT

Evolution: The Evidence b As an adult you still have a tail bone, called the coccyx bone b Remnant of this bone plus other things such as the appendix, and ear muscles are called Vestigial Structures b Vestigial Structures are organs or body parts that no longer have a purpose

Evolution: The Evidence b Evolution can also be studied at cellular level as well b All living things made up from cells b For all living organisms made the molecule for life is DNA b DNA made up of 6 basic elements b Oxygen, Nitrogen, Hydrogen, Phosphorus, Sulfur, Carbon

Evolution: The Evidence b All cells contain the same building blocks of proteins, fats, and carbohydrates b Most cells have a nucleus and a nuclei; have gel like layer of cytoplasm b More closely related the organism, more they have in common

Evolution: The Evidence b Human Question? b Human DNA is 99% identical to chimpanzee DNA b Humans Chimpanzees, Apes belong to group of mammals called PRIMATES

Evolution: The Evidence b ALL PRIMATES HAVE THESE TRAITS b Opposable thumbs, binocular vision, rotating shoulder, large brain