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Evolution: Chapter 5 Lesson 1 Modified from L. Gilmore 2013 5.1 Natural Selection Vocabulary Page 57 • Evolution is change over time. • The naturalist Charles Darwin was the first person to write a thorough collection of evidence supporting evolution. • Species a group of organisms that share traits AND can reproduce a fertile offspring. 5.1 Natural Selection Darwin’s Claims Page 57 • Darwin made OBSERVATIONS about the diversity and uniqueness of organisms. • He then made CLAIMS about the process responsible for this diversity. • Darwin used all his years of observations as EVIDENCE to support these claims. Next To 57 Voyage of the Beagle • Look at Figure 2 on pg 211. • Where did the HMS Beagle stop before reaching the Galapagos Islands? • Multiple locations on South America Fun Fact: The entire voyage took 5 years 5.1 Natural Selection Voyage of the Beagle 5.1 Natural Selection Tortoises Page 57 • Darwin found giant tortoises on all the Galapagos Islands, but nowhere else. • He wondered why they were so different even though they lived on islands only about 50 miles apart. • He reasoned that each new population changed slightly, or evolved, to fit its unique environment on the island. 5.1 Natural Selection Tortoises Next To 57 • Read the first two paragraphs on pg 212. What is unique about these tortoises? Dome-shaped Saddle-shaped 5.1 Natural Selection LEFT- Tortoises Next To 57 • Read the first two paragraphs on pg 212. What is unique about these tortoises? Dome-shaped Saddle-shaped Short necks Long necks Eat low growing plants Eat high growing cactus. 5.1 Natural Selection Tortoises Next To 57 • Why might one tortoise population evolve long necks? • Share with your partner. - Species Page 58 – Western spotted skunk, – mountain lions – great white sharks – With your partner think of four other species, and write them down. 5.1 Natural Selection Vocabulary Page 58 • Selective breeding is breeding plants and animals to get offspring with desired characteristics based on HUMAN needs only. Not a Species Page 58 – A mule is the offspring of a male donkey and a female horse. Horses and donkeys are different species, with different numbers of chromosomes. – A liger is the offspring of a male lion and a female tiger. These are both examples of selective breeding, even if accidental. Liger in action Not a Species Next To 58 •Summarize what you learned about ligers! •3-5 sentences! •Now summarize what you learned today •5-8 sentences!