14.2_ppt.ppt - Lesson Overview Human Genetic Disorders...

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Lesson Overview Lesson Overview Human Genetic Disorders Human Genetic Disorders Lesson Overview Lesson Overview 14.2 Human 14.2 Human Genetic Disorders Genetic Disorders
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Lesson Overview Lesson Overview Human Genetic Disorders Human Genetic Disorders Student Objectives: I can explain how small changes in DNA cause genetic disorders. I can summarize the problems caused by nondisjunction.
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Lesson Overview Lesson Overview Human Genetic Disorders Human Genetic Disorders THINK ABOUT IT Have you ever heard the expression “It runs in the family”? Relatives or friends might have said that about your smile or the shape of your ears, but what could it mean when they talk of diseases and disorders? What is a genetic disorder?
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Lesson Overview Lesson Overview Human Genetic Disorders Human Genetic Disorders 14.2 Bellringer…. Gender Benders You may remember that in humans, a sperm cell may carry an X chromosome or a Y chromosome, while an egg cell can have only an X chromosome. Sometimes, errors during meiosis in one of the parents produce offspring with an abnormal number of sex chromosomes. 1. On a sheet of paper, construct a Punnett square for the following cross: XX x XY . Fill in the Punnett square. What does the Punnett square represent? According to the Punnett square, what percentage of the offspring from this genetic cross will be males? What percentage will be females ? 2. On a sheet of paper, construct a Punnett square for the following cross: XXX x XY. Fill in the Punnett square. How is this Punnett square different from the first one you constructed? What might have caused this difference? 3. How do the offspring in the two Punnett squares differ?
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  • Summer '16
  • Lauen Miller
  • Genetics, Human Genetic Disorders

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