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Kurowski/Biology Name: Genetics: Polar Bear Book 8-4 Reading Guide 1. Most Traits are Not Controlled by Simple ____________________________________________ 2. When several genes influence a trait, the trait is ___________________________________________ 3. Give two examples of polygenic traits: ___________________________________________ 4. Give an example of incomplete dominance: ___________________________________________ ___________________________________________ 5. Give an example of codominance: ____________________________________________ ____________________________________________ ___________________________________________ 6. Explain the difference between incomplete dominance & codominance. ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ ___________________________________________ 7. What is a multiple allele: ___________________________________________ Give an example: ____________________________________________ ____________________________________________ 8. What are the four blood types possible in humans: _____________________ 9. How does the color of hydrangea depend on the environment? ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ 10. How does the fur color of Siamese cats depend on the environment? ____________________________________________ ___________________________________________ ____________________________________________ ____________________________________________ 11. What human trait is influenced by environment? ___________________________________________ 12. Some Traits Are Caused by ____________________________________________ 13. Why are most bald people men? ____________________________________________ ____________________________________________ ____________________________________________ Period: 14. What is a mutation? ____________________________________________ ____________________________________________ ____________________________________________ 15. Sketch the shape of blood cells of people that have sickle cell anemia and normal blood cells. 16. Why does the shape of the blood cell cause problems? ____________________________________________ __________________ 17. What advantage do people with the heterozygous condition for sickle cell anemia have? ____________________________________________ _______ 18. What is hemophilia? ________________________________________ 19. What are the symptoms of Huntington's disease? ____________________________________________ ____________________________________________ 20. What is genetic counseling? ___________________________________________ ____________________________________________ ___________________________________________ 21. What would happen to a baby if PKU was not diagnosed early? ____________________________________________ ____________________________________________ 22. What is gene therapy? ____________________________________________ ____________________________________________ 23. What are the symptoms of cystic fibrosis? (see Table 8-2) ____________________________________________ ____________________________________________ 24. What are the symptoms of Tay-Sachs disease (see Table 8-2) ____________________________________________ ____________________________________________ 25. See Health Watch: Genetic Counseling What kind of people may want to see a genetic counselor? ____________________________________________ ____________________________________________ 26. What procedures do genetic counselors perform? ____________________________________________ ___________________________________________ ____________________________________________ ____________________________________________