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Human Evolution-An Overview PowerPoint Presentation

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Description : Check out this medical presentation on Genetics, which is titled "Human Evolution: an overview", to learn about Human Evolution.

Tags : Genetics, Human Evolution, overview

Published on : Aug 29, 2021 | Views : 2665 | Downloads : 1

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Dr Jeremy Pritchard Human Evolution: an overview
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Hominoid: Great apes and humans Hominid: Closer to us than gorillas and chimps
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Humans did not evolve from Apes You are descended from your mother and father You are related to your aunt and cousin Dad Mum Aunt Uncle You Cuz
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Common ancestor
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Contemporary animals
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Contemporary animals Fossils
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Organisms with common features are likely to have a more recent common ancestor.
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Locomotion
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Brachiation: Grip Stereo vision
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Humerus Femur
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1. Chimpanzee 2. Australopithecus africanus 3. Homo erectus 4. Homo sapiens
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Brain size
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Primate Characteristics/Trends Brains larger than other animals
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Log body weight (g) Log brain weight (g) Brains larger than other animals Brains larger than other animals in relation to body size
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sex age stature race/species pathological conditions skeletal trauma Information from the skeleton
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Trauma
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Trauma
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Trauma
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Trauma
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Proconsul
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Sahelanthropus tchadensis close to the common ancestor of humans and chimpanzees @ 7 million years
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Australopithecus afarensis Lucy, discovered in Ethiopia in 1974.
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Australopithecus africanus Southern Ape of Africa
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Don’t run before you can walk
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Homo habilis (ca. 2.5-1.6 mya)
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Homo erectus (1.6 mya-300 kya)
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Homo neanderthal Homo erectus Homo sapiens ramapithicus Australopithicus africanus Homo habilis
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Neanderthals (ca. 100-32 kya)
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Neanderthals (ca. 100-32 kya) Restricted to Europe, eastern Middle East during Ice Age Evolved to be cold-adapted: Short and stocky Large nose (for warming air) Barrel chest (for warming air) Long, low, thick skull but with large Brain
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Neanderthals are not our ancestors
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Krings et al 1997 Neandertal DNA Sequences and the Origin of Modern Humans NOT our ancestors….
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Are we still evolving? Microevolution: change in gene frequency - YES Macro evolution : formation of species - NO
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Are we still evolving? Some parts of Africa have seen an increase in the frequency of a gene called CCR5-32 Protects against infection with HIV-1. May have been selected for during bubonic plague
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25,000 genes 25, 000 genes Human Evolution - Chimps are our closest relative
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