Darwins Discovery and Chimps and Humans BI.7 a. Students know why natural selection acts on the phenotype rather than the genotype of an organism. BI. 8. a. Students know how natural selection determines the differential survival of groups of organisms. BI. 8. b. Students know a great diversity of species increase the chance that at least some organisms will survive major changes in the environment BI. 8. e Students know how to analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction. Standards: SWBAT (in regards to human evolution) Explain how natural selection determines the differential survival of groups of organisms. Analyze multiple sources of evidence for evolution. Explain how a great diversity of species increase the chance that at least some organisms will survive major changes in the environment Analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction. Objectives: Light will be thrown on the origin of man and his history Didnt talk about humans in On the Origin of Species, to avoid prejudice of his findings 1871, The Descent of Man and Selection in Relation to Sex Darwin Gravity Cell Theory Mendelian Genetics Accepted Theories Human Evolution Humans and great apes shared a common ancestor 5 million years ago Common ancestor was a knuckle-walker What is Human Evolution? Modern humans have an ancestor that evolved into the humans we have today Chimpanzees are closely related to humans because they share this ancestor What is Human Evolution? Big brain, relative to body size More upright posture Arm structure (side to side) Teeth Binocular vision Opposable thumb Five fingers and toes Morphological Evidence of Shared Ancestry DNA sequences 96-99% identical DNA sequences code for similar proteins Both have lots of deletions in their DNA sequences Allows opportunities for mutations (evolution) Molecular Evidence of Shared Ancestry between Chimps and Humans Tool usage Child rearing Social interactions Emotions Delayed sexual maturity Hunting Shared Behaviors If chimps and humans share a common ancestor then this would suggest that humans ancestor changed over time=evolution!!!! BIG BIG IDEA!!! True/False-Humans evolved from monkeys. How similar are humans and chimps genetically? List 3 morphological similarities between humans and chimpanzees. What is the evolutionary relationship between humans and other primates? Summary Questions