Charles Darwin. The Theory of Evolution
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1 The Theory of Evolution Darwin Notes Pt. 2 Charles Darwin Darwin was born in 1809 in England. He was from a strong Christian family. Age 16, Darwin was sent by his father to study medicine He left and enrolled at Cambridge to become a clergyman A career that allowed him to pursue his interest in becoming a naturalist He loved science & decided to take several voyages around the world to study. At 22, he set out on the HMS Beagle 1
2 Charles Darwin Proposed a way how evolution works How did creatures change over time? By natural selection Collected a lot of evidence to support his ideas Voyage of The H.M.S. Beagle Darwin took his ship, the H.M.S Beagle around the world to study the rocks (geology), flora (plants) and fauna (animals) around the world. He ended up in the Galapagos Islands in the Pacific Ocean. He saw many strange creatures and studied them over many years. 2
3 Voyage of The H.M.S Beagle Stopped in Galapagos Islands 500 miles off coast of Ecuador Galapagos Most of animals on the Galápagos live nowhere else in world, but they look like species living on South American mainland. 3
4 What Was Found? Darwin found many unique species Giant Galapagos Tortoise Red Footed Booby Galapagos Iguana Galapagos Finches Many of Darwin s observations made him wonder why? Giant Galapagos Tortoise 4
5 What Was Found? Different shells on tortoises on different islands Darwin asked: Is there a relationship between the environment and what an animal looks like? Red Footed Booby 5
6 Galapagos Iguana Galapagos Finches 6
7 Darwin s Finches Each island had a unique species, each with a different beak size and shape There were 14 different species of finches (birds) on the Galapagos Islands, that are unique to that area. Darwin hypothesized that finches from the mainland could have evolved into separate species on the island by natural selection Darwin s Finches As the birds with smaller beaks died off, the birds with larger beaks continued to eat the food and mate / have offspring. The large beak genes were passed on to these offspring, and eventually all the finches had large beaks, because the small beak gene was wiped out of the population. The finches have evolved over many generations to better survive in the environment. 7
8 Darwin s Finches Darwin s Conclusions: Variations in Beaks differences in beaks in the original flock adaptations to foods available on islands Natural Selection for the Most Fit over many generations, the finches were selected for specific beaks & behaviors Offspring Inherit Successful Traits accumulation of winning traits: both beaks & behaviors Separate into Different Species More Evidence for Darwin Darwin found Evidence in fossils that creatures have changed over time. ancient Armadillo present day Armadillos 8
9 Darwin s View of Evolution Giraffes that already have long necks survive better Leave more offspring who inherit their long necks Variation Selection & Survival Reproduction & Inheritance of more fit traits Darwin Came Up With Two Main Points 1. Descent with Modification 2. Natural Selection 9
10 Darwin and Descent with Modification Darwin Found The differences between species of finches were associated with the different food they ate. All finches came from one ancestor but eventually over time nature selected for different species with different beaks. Darwin and Natural Selection Survival of the Fittest Natural Selection is also known as survival of the fittest. This means that the strongest of the species, the ones with the best natural defenses, or the ones with the most advantageous variations, will survive. 10
11 Natural Selection Requirements 1. Variation - Individuals in a population have differences 2. Heritability - Variations are inherited from parents 3. Overproduction - Populations produce more offspring than can survive 4. Reproductive Advantage - Some variations allow organisms to have more offspring than other organisms. Natural Selection and Differential Survival Only a limited amount of organisms in each population can survive. So the traits that are left in that population can either help the population to survive & thrive & therefore evolve, or harm it & cause it to become extinct. What might limit population size? Access to Food Predators Sunlight Space Water 11
12 Let s Think Can you think of a physical trait that would give an organism an advantage in obtaining one of these limiting factors? Access to Food Predators Sunlight Space Water Variation In Moths 12
13 What gives this moth an advantage? Let s Think What would happen if pollution made trees darker? 13
14 Darker Moths Become More Common! Is this Evolution? Yes, it is because evolution works on populations Evolution: A change in a population over time. 14
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