Human Evolution Darwin’s Discovery and Chimps and Humans.

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Presentation transcript:

Human Evolution Darwin’s Discovery and Chimps and Humans

Standards: BI.7 a. Students know why natural selection acts on the phenotype rather than the genotype of an organism. 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. 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. 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. BI. 8. e Students know how to analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction.

Objectives: SWBAT (in regards to human evolution) Explain how natural selection determines the differential survival of groups of organisms. Explain how natural selection determines the differential survival of groups of organisms. Analyze multiple sources of evidence for evolution. 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 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. Analyze fossil evidence with regard to biological diversity, episodic speciation, and mass extinction.

Darwin “Light will be thrown on the origin of man and his history” “Light will be thrown on the origin of man and his history” Didn’t talk about humans in On the Origin of Species, to avoid prejudice of his findings Didn’t 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 1871, The Descent of Man and Selection in Relation to Sex

Accepted Theories Gravity Gravity Cell Theory Cell Theory Mendelian Genetics Mendelian Genetics

Human Evolution

What is Human Evolution? Humans and great apes shared a common ancestor 5 million years ago Humans and great apes shared a common ancestor 5 million years ago Common ancestor was a knuckle- walker Common ancestor was a knuckle- walker

What is Human Evolution? Modern humans have an ancestor that evolved into the humans we have today Modern humans have an ancestor that evolved into the humans we have today Chimpanzees are closely related to humans because they share this ancestor Chimpanzees are closely related to humans because they share this ancestor

Morphological Evidence of Shared Ancestry Big brain, relative to body size Big brain, relative to body size More upright posture More upright posture Arm structure (side to side) Arm structure (side to side) Teeth Teeth Binocular vision Binocular vision Opposable thumb Opposable thumb Five fingers and toes Five fingers and toes

Molecular Evidence of Shared Ancestry between Chimps and Humans DNA sequences 96-99% identical DNA sequences 96-99% identical DNA sequences code for similar proteins DNA sequences code for similar proteins Both have lots of deletions in their DNA sequences Both have lots of deletions in their DNA sequences Allows opportunities for mutations (evolution)Allows opportunities for mutations (evolution)

Shared Behaviors Shared Behaviors Tool usage Tool usage Child rearing Child rearing Social interactions Social interactions Emotions Emotions Delayed sexual maturity Delayed sexual maturity Hunting Hunting

BIG BIG IDEA!!! If chimps and humans share a common ancestor then this would suggest that humans’ ancestor changed over time=evolution!!!! If chimps and humans share a common ancestor then this would suggest that humans’ ancestor changed over time=evolution!!!!

Summary Questions True/False-Humans evolved from monkeys. True/False-Humans evolved from monkeys. How similar are humans and chimps genetically? How similar are humans and chimps genetically? List 3 morphological similarities between humans and chimpanzees. List 3 morphological similarities between humans and chimpanzees. What is the evolutionary relationship between humans and other primates? What is the evolutionary relationship between humans and other primates?