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September 17, 2013 Humans and Evolution Tuesday.docx

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York University
Natural Science
NATS 1610

Humans And Evolution Readings: Chapter 1, Chapter 23 443-455 Humans and Evolution -Basic characteristics for living things; • Take in energy and materials from environment , sense and respond to stimuli, reproduce and grow, consist of one or more cell, maintain homeostasis, undergo evolution -Organisms are classified into groups based on their characteristics (Living characteristics, physical, structural characteristics) Also seen as the 3 domain system of classification • Bacteria • Archaea (live in hot springs, places with high acidity, under glaciers, intense conditions) • Eukarya (bigger organisms, more complex organisms) o Protists, plants, fungi, animals -Everything comes from a common ancestor - -Kingdoms: Anamalia, Plantae, Fungi, Protists (all part of Eukarya domain) • Share a similar body organization (membrane bound nucleus) • All adapted for niches and life styles • Domains archaea and bacteria have a lack of membrane bound nucleus -In Latin evolitio means “unrolling” -descent through modification, development of body structures, change through time -Taxonomy: is concerned with identifying, naming and classifying organisms • Broken down into Kingdom, Phylum, Class, Order, Family, Genus, Species • Humans fall into the respective categories; Kingdom: anamalia, Phylum: vertebrata, Class: mammalia, Order: primates, Family: hominidae, Genus: homo, Species: sapiens o With other organisms things are always changing • Taxonomy reflects “relatedness” -Humans and Primates: humans and apes share a common apelike ancestor • Flexible shoulder joints, grasping forelimbs with 5 digits, grasping feet, forward facing eyes, small litter size, etc o Many things that relate to the human race • Happened about 25 million years ago when you started seeing larger differences -Speciation: the formation of new species (humans did not evolve f
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