GENETIC TRAITS IN HARRY POTTER DOMAIN 3-GENETICS

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1 Learning Outcomes: Students will be able to: Define the basic genetic terms and concepts DNA, chromosome, gene, allele, homozygous, heterozygous, recessive and dominant genes, genotype, phenotype, and Mendelian inheritance. Use Punnett Square to predict possible genotypes of children with known genotypes of their parents, and vice versa. Apply genetic terms and concepts in identifying and predicting possible inheritance patterns. Background Information: J. K. Rowling's Harry Potter series offer richly described characters whose appearances can serve as examples of how parents pass their genes with specific genetic traits to their children. Harry has the same bright green eyes that his mother, Lily, is described with. The Weasley family is known for their red hair and freckles. Draco Malfoy seems to have inherited the almost white blond hair and gray eyes in his father, Lucius. Hagrid is a son produced by a human and a giantess and his size is somewhere between a normal wizard and a giant. These Harry Potter characters provide a way for you to explore and apply basic concepts in genetics to the fictional characters that you may already know much about by having read the series or watched the movies.

2 Procedures: A. Vocabulary: Fill in the following table of basic genetic terms, using the websites below or a scientific website of your choosing. Be sure to write in your own words! Talking Glossary of Genetic Terms or DNA from the Beginning's Classical Genetics Genetic Terms Definition in your own words Allele Genes Dominant Recessive Homozygous Heterozygous Genotype Phenotype Mendelian Inheritance

3 B. Use the Harry Potter Genetics PowerPoint slides and answer the questions. (Be sure to show all of your work!) 1. Using F and f, what are possible genotypes of the allele pair for freckles? 2. Using r (red hair) and R (brown hair) alleles, what possible genotypes of the allele pair are there? 3. What are their genotypes? (Case 1) 4. Draw a punnett square to show possible genotypes for their child 5. What % chance does their child have of having freckles? 6. What are their genotypes? (Case 2)

4 7. Draw a punnett square to show possible genotypes for their child 8. What % chance does their child have of having freckles? 9. Draw a punnett square for both traits to show possible genotypes for their children. (*For freckles you will cross one homozygous with a heterozygous) 10. What is the probability of their children having red hair and freckles? 11. Harry has dark/brown hair like his father, but his mom had red hair. Using the genotypes of rr, Rr, and RR, what possible phenotypes does each of the Potters have? 12. Harry marries Ginny who has red hair. What are possible genotypes of their children s hair colors?

5 C. Use the chart below to determine your phenotype (appearance) and possible genotypes (a pair of alleles). If you have the dominant phenotype, you should include both the homozygous and heterozygous genotypes see the examples on Tongue Rolling on the first row. Trait Possible alleles Your Phenotype Your Genotype(s) Tongue Rolling Able to roll (R) Ex., able to roll RR (homozygous) or Rr (heterozygous) Unable to roll (r) Freckles Have freckles (F) No freckles (f) Widow s peak Widow s peak(w) Straight (w) Earlobe Free hanging (A) Attached (a) Cleft chin Have cleft (C) No cleft (c) Thumb Hitchhiker s (H) Straight (h) Dimples Dimples (D) No dimples (d) 1. Did you have mostly dominant or recessive traits?

6 2. Complete the Punnett Square on the right using your own genotype for each trait. (If you have both heterozygous and homozygous genotypes for having a dominant trait, choose one to use.) The other person s genotype is provided to you. After completing the Punnett Square, identify possible phenotypes of offspring and the probability of each phenotype in percentage. a) Freckle genotypes: Yours & the other person s Ff List possible Phenotypes % (Probability of inheritance) b) Tongue rolling genotypes: Yours & the other person s rr List possible Phenotypes % (Probability of inheritance) c) Dimple genotypes: Yours & the other person s DD List possible Phenotypes % (Probability of inheritance)

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