Evolution - Chamblee Middle School

Evolution - Chamblee Middle School

Evolution The Theory of Natural Selection Vocabulary Chapter 7 Chapter 8 Evolution Camouflage pg. 493 Relative Dating Hominid Adaptation Mimicry pg. 493 Absolute Dating Homo Sapiens Speciation

Darwin Neanderthal Fossil Species Extinct Geologic Time Scale Fossil Record Primate Trait Selective Breeding Hominid 4 Steps of Natural Selection Natural Selection 1. Overproduction Niche

2. Inherited Variation Inheritance 3. Struggle to Survive 4. Successful reproduction Plate Tectonics Precambrian Paleozoic Mesozoic Cenozoic Primate Homo Erectus Australopithecus afarensis What is Evolution? Description/Definition the process of adaptation by which different types of living organisms develop and

change from earlier forms throughout the history of the earth due to environmental and/or genetic changes. o Natural Selection o Genetic drift (frequency of alleles) o Genetic flow (transfer of alleles) o Genetic mutations (molecular Clock) o https:// www.youtube.com/watch?v=GhH OjC4oxh8 Misconceptions Only happens through natural selection Genetic mutations are always bad All traits are adaptive or useful like feathers https://www.youtube.com/watch?v=hPLgfGX1I5Y Organisms that appear later in the history of life are somehow better or more advanced than those that

evolved earlier like the freezing frog o https://www.youtube.com/watch?v=TYJv-wxwvLw Evolution is only random/not random o o https://www.youtube.com/watch?v=sjeSEngKGrg (Rock Pocket Mouse) Changing to Survive Adaptations A characteristic in a population that helps an organism survive and reproduce in its environment o Fur color o Beaks o Mimicry Species a group of organisms that can mate with one

another to produce fertile offspring. Groups of individuals of the same species living in the same place make up a population. Selective Breeding Exceptions Man made like mules or ligers o Camouflage o https://www.youtube.com/watch?v=__ ZvtiRVlpk Who is Charles Darwin Naturalist 1831- 5 year trip on HMS Beagle to Galapagos Islands Observes hundreds of organisms and analyzes characteristics

Needs 4 Supportive Theories Inherited variations from his observations Selective Breeding traits are passed down through genes An Essay on the Principle of Population by Malthus populations are limited by resources but will produce more than can survive Principles of Geology, by Charles Lyell o Finches beak shapes for different seeds Earth is OLD enough for evolution to happen Plate Tectonics fossil support 1859 On the Origin of Species by Means of Natural Selection

before Wallace whom had same ideas http://www.sciencekids.co.nz/videos/f amousscientists/charlesdarwin.html Darwins Theory Of Natural Selection Natural selection is the process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted organisms do What is Natural Selection - https:// www.youtube.com/watch?v=0SCjhI86grU Natural Selection in Action Environmental resources o Changes based on food sources like Darwins Finches o Develop Niche -the ecological role of an organism in a community especially in regard to food consumption Adaptation from Hunting o Elephant born without tusk increase in population

Insecticide Resistance New Species Evolution Speciation is the formation of a new species as a result of evolution 1. Separation 2. Adaptation 3. Division (SAD) Evidence Observation/Physical Fossils o remains or imprints of once-living organisms found in layers of rock Fossil Record o timeline of life by dating fossils Relative- estimating age based on relationship with other fossils in record Absolute measuring age in years based on atomic decay o organizes fossils by their estimated ages and physical similarities

Ex. Whale hip bones pg. 170-171 Genetics o analyze many organisms DNA, RNA, proteins, and other molecules and identify identical gene sequences Yeast species examples Evidence video https:// www.youtube.com/watch?v=lIEoO5KdPvg Examples Geological Times Scale Timeline that is used by scientists to outline the history of Earth and life on Earth. Some of the important divisions in the geologic time scale mark times when

rapid changes happened on Earth. o Many species died out completely, or became extinct. When a species is extinct, it does not reappear. At certain points in the Earths history, a large number of species disappeared from the fossil record. These periods when many species suddenly become extinct are called mass extinctions. Human Evolution Primates a group of mammals that includes humans, apes, monkeys, and lemurs o first primates did not exist until after the dinosaurs died out o 45 Mya traits similar to monkeys, apes, and humans.

Hominids any of a family (Hominidae) of erect bipedal primate mammals that includes recent humans together with extinct ancestral and related forms 6-8 Mya first walk upright (Bipedal walk upright on two feet) Share common ancestor with Apes Hominid Evolution Homo Naledi new species (2013) traits of Australopithecus and Homo genus http://www.bbc.com/earth/bespoke/story/20150311-the-15-tweaks-that-made-us-human/ http://www.becominghuman.org/ http://humanorigins.si.edu/evidence/human-evolution-timeline-interactive

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