Definition Evolution Gradual change 6 HW 3 Not

Definition Evolution = Gradual change 6 HW 3: Not only livint things have changed. So has the Earth: Go to p. 497 and copy the map of Gondwana with the Glossopteris fossil remains.

What caused the invention of sex on earth? Before sex, there were only non-sexually-reproducting organisms. Can you imagine what was the world like then? - More CO 2 Little amounts of O 2 Photosynthetic bacteria More than 3. 000 million years with single-celled life forms (Very slow evolution). 7

Variation Members of the same species are not all exactly the same. Differences between individuals from the same species are called variation. 8

Questions Make a list of five kinds of variation between dogs. 1. 2. 3. 4. 5. Suggest why scientists say that they belong to the same species. ____________________________________________________ 9

Variation There are two kinds of variation within a species (continuous and discontinuous). The environment can affect the variation in a species. Handout: Frequency diagrams 10

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Exercise 1 What kind of variation does this chart display? 12

Exercise 2 How about this one? 13

Jean Baptiste de Lamarck believed that organisms evolved by passing acquired characteristics to their offspring. 14

August Weissmann cut off the tails of 901 mice to disprove theory of heredity of an acquired characteristic. 15

Charles Darwin studied variation in birds at the Galapagos islands. Learn more about Darwin’s life on https: //www. biography. com/people/charles-darwin-9266433 HW 4: Do the Mini. Lab section on p. 813. Answer only questions 1, 2, 3. 16

What is evolution? - Full definition: Main “ingredients”: How is DNA linked to evolution? 17

Watch this video about Darwin’s fantastic voyage. 18