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Do Now: Top of page 19

Do Now: Top of page 19.

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Do Now: Top of page 19

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  1. Do Now:Top of page 19

  2. This dog is standing on thousands of frozen fish! It is assumed that the fish were frightened into shallow waters by whales and the water froze solid before the fish could escape. The local temperature was about -8 C (17 F). Though other fish have been chased into the bay by predators before, this is the first known occurrence of getting trapped in the ice.As the ice thaws, the fish will probably be scavenged by birds.

  3. Go Over 18 – 21 in Packet

  4. Homework Review 13. 14. 15.

  5. Homework Review 16. Which statement does the fossil record best support? 1. Many organisms that lived in the past are not extinct 2. Species occupying the same habitat have identical environmental needs 3. The struggle for existence between organisms results in changes in populations 4. Structures such as leg bones and wing bones can originate from the same type of tissue found in embryos

  6. Homework Review 17. One explanation for the variety of organisms present on Earth today is that over time 1. evolution has caused the appearance of organisms that are similar to each other 2. new species that are adapted to fill available niches in the environment have evolved 3. each niche has changed to support a certain variety of organism 4. the environment has remained unchanged, causing rapid evolution

  7. Homework Review • The economist who reasoned that if the human population continued to grow unchecked, eventually there would not be enough resources was 1. Lamarck 2. Darwin 3. Malthus 4. Hutton

  8. Homework Review 19 20,21

  9. Homework Review • Modern giraffes evolved from a short-necked ancestor by stretching their necks to reach the leaves on high branches. Over time, adults with longer necks passed the trait on to their offspring. 22. Using the modern theory of evolution as the basis, evaluate the accuracy of the passage. 23. Explain why the lengthened necks of the giraffes described in the passage cannot be passed on to offspring. 24. Using the theory of evolution by natural selection, explain why the number of giraffes with long necks will increase over time.

  10. Section 17.2 – Evolution as a Genetic Change in Populations Page 9

  11. Genetic Drift • Random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population

  12. Bottleneck Effect • A change in allele frequency following a dramatic reduction in the size of a population • Caused by – a disaster such as disease

  13. Founder Effect • Change in allele frequencies as a result of the migration of a small subgroup of a population

  14. Genetic Equilibrium • Situation in which allele frequencies in a population remain the same Hardy-Weinberg Principle Write this under Genetic Equilibrium • States that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change

  15. Do Now: Page 45 Homework: Page 492, 2 – 4

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