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3.1 Natural Selection and the Evidence for Evolution
Transcript of 3.1 Natural Selection and the Evidence for Evolution
Leaf frog uses camouflage to avoid being detected by predators What can you see in the sand? Mimicry – a structural adaptation that enables one species to resemble another species. Mimicry Mole-rats adaptations
Large teeth – defend against predators
Large claws – defend against predators and dig better tunnels any variation that aids an organism’s chances of survival in its environment Charles Darwin (1809 – 1882) Charles Darwin and Natural Selection Vestigial structures Analogous structures Structural features with a common evolutionary origin Homologous structures Vocabulary Galápagos tortoises are the largest on Earth, differing from other tortoises in body size and shape. Galapagos marine iguanas eat algae from the ocean, an unusual food source for reptiles. Large claws help them cling to slippery rocks. The beak of the Galápagos finch is adapted to feed on cactus. syrphid fly - harmless but resembles the yellow jacket yellow jacket - not harmless Can you spot the pigmy seahorse in the coral? Can you see the shrimp in the sea urchin? What am I? Grass? Can you see these nocturnal birds found in Tasmania, Australia? The End The body parts of organisms that do not have common evolutionary origin but are similar in function structures which no longer serve a purpose insect and bird's wings are similar in function but not structure. The main points of Glencoe Biology: Dynamics of Life, Mexico. Unit 1
Natural Selection and the Evidence for Evolution Embryology An embryo is the earliest stage of growth and development of both plants and animals It is the shared features in the young embryos that suggest evolution from a distant, common ancestor. Biochemistry Biochemistry also provides a strong evidence for evolution. Nearly all organisms share DNA, ATP, and many enzymes among their biochemical molecules. In 1831 he took a job on the HMS Beagle On the is islands, Darwin studied many species of animals and plants that are unique to the islands but similar to species elsewhere. Distinguishing Characteristics on the Galapagos Islands Adaptation The monarch resembles the viceroy. The viceroy has a bitter taste that predators do not like. Darwin's Observations on the mainland Organisms have too many offspring individuals struggle to compete only some individuals survive Finches migrate from South America to the Galapagos Islands different conditions resulted in new traits being favored gradual changes got to the point where island finches were considered a new species Darwin's Hypothesis on the Origin of Galapagos Finches Research with Pigeons traits of individuals vary variations are then inherited by breeding pigeons with desirable variations, Darwin produced offspring with these variations Artificial selection The 4 Principles of Natural Selection organisms have too many offspring - OVERPOPULATION all populations have variations, useful variations are passed on organisms without useful variations won't survive over time, offspring with certain variations make up most of the population and may look different an adaptation that enables species to blend in with their surroundings Scientists combine data from to interpret relationships among species structural adaptations fossils anatomy embryology biochemistry