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Understanding Blood Types and Genetic Traits: A Lecture on Dominance and Disorders

In this lecture by Mr. Sover on December 9, 2009, students engage in a quiz about phenotypes, including blood types and sex-linked traits in Drosophila. The session emphasizes the use of Punnett Squares to explore genetic probabilities, while highlighting the impact of genetic disorders such as Cystic Fibrosis and Huntington’s Disease. The lecture covers key concepts like dominance, codominance, and incomplete dominance, as well as the effects of abnormal proteins on human health. A homework assignment on chapter 8 study guide is included for further learning.

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Understanding Blood Types and Genetic Traits: A Lecture on Dominance and Disorders

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  1. Lecture 45 Mr. Sover 9 December 2009

  2. Collect Homework

  3. Quiz • Clear off desks and silence yourselves.

  4. Quiz • 1. What are the blood types (phenotypes)? • 2. A man with AB blood reproduces with a woman with heterozygous B blood. What are the most probable genotypes for the children? Use a Punnett Square for help (2 points). • 3. Remember, eye color in drosophila is considered to be sex-linked. Red eyes are dominant over white eyes. If a Red-eyed male reproduces with a female who is a carrier for white eyes, what are the most probably genotypes for the children? Use a Punnett Square for help. (2 points). • 4. If you could eat a person in this room, who would it be and why?

  5. Begin Lecture

  6. Chapter 8-Be Sure to know… • Dominance • Codominance • Incomplete Dominance • Sex-linked traits

  7. Human Genetic Disorders • Created by the production of abnormal proteins.

  8. Cystic Fibrosis • Most notably it harms which organ systems? • 1. • 2. • Passageways become plugged up with mucus. • Infection • Proper digestion cannot occur. • Enzymes • The transport of ions across cells is abnormal.

  9. Chloride ions trapped. • The mucus becomes thick and is not swept away. • Child with CF

  10. Huntington’s Disease • Not recessive! • Deteriorating brain cells. • Memory loss • Irritability • Jerking extremities • Eventual death

  11. Homework • Do pages 43-45 of the chapter 8 study guide.

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