1. Harry Potter Genetics

2. 1. Ron Weasley has red hair. What is his genotype? bb

3. 2. Harry Potter has brown hair. What are his possible genotypes? BB or Bb

4. 3. If a wizard is heterozygous for hair color, what is his genotype? Bb 4. What is his phenotype? Brown hair

5. 5. Harry Potter’s dad James is homozygous for brown hair. What is his genotype? BB

6. 6. Harry, Ron, and Hermione have magical abilities. What is their genotype? mm

7. 7. A man is heterozygous for magical ability. What is his genotype? Mm 8. Would he be a muggle or a wizard? muggle

8. Molly and Arthur Weasley both have red hair. 9. What are their genotypes? Molly: Arthur: bb

9. Molly and Arthur Weasley both have red hair. 10. Set up and fill in a Punnett square. bb b

10. Molly and Arthur Weasley both have red hair. bb b 11. What is the probability their children will have red hair? Probability of red hair (bb): 4 out of 4 or 100%

11. Harry Potter’s mom Lily had red hair. His dad James was homozygous for brown hair. 12. What are their genotypes? Lily: James: bb BB

12. Harry Potter’s mom Lily had red hair. His dad James was homozygous for brown hair. 13. What was the probability that Harry would have brown hair? bb BB

13. Harry Potter’s mom Lily had red hair. His dad James was homozygous for brown hair. 13. What was the probability that Harry would have brown hair? bb BB B Bb b Probability of brown hair (BB or Bb): 4 out of 4 or 100%

14. 14. Harry Potter (genotype Bb) marries Ginny Weasley, who has red hair (bb). What is the probability their children will have red hair?

15. 14. Harry Potter (genotype Bb) marries Ginny Weasley, who has red hair (bb). What is the probability their children will have red hair? Bbbb Bbbb b Probability of red hair (bb): 2 out of 4 or 50% B b

16. Hermione has brown hair. She marries Ron, who has red hair. They have two children, who both have red hair. 15. What must Hermione’s genotype be?

17. Hermione has brown hair. She marries Ron, who has red hair. They have two children, who both have red hair. 15. What must Hermione’s genotype be? Bb bb B b Ron (red hair): bb Hermione (brown hair): BB or Bb Children (red hair): bb b b For the children to have red hair, Hermione must be heterozygous (Bb).

18. Hermione has brown hair. She marries Ron, who has red hair. They have two children, who both have red hair. 15. What must Hermione’s genotype be? Bb B If Hermione were homozygous for brown hair (BB), all of their children would have the genotype Bb and would have brown hair. b b

19. 16. Hermione is a witch. Her parents are muggles. What must Hermione’s parents’ genotypes be?

20. 16. Hermione is a witch. Her parents are muggles. What must Hermione’s parents’ genotypes be? MMMm mm MmMm Hermione’s genotype must be mm because she has magical abilities. The only way she could have the genotype mm is if both of her parents were heterozygous (Mm). M m

21. 17. If Hermione had a brother, what is the probability he would be a muggle? MMMm mm MmMm M m

22. 17. If Hermione had a brother, what is the probability he would be a muggle? MMMm mm MmMm M m Genotypes for muggle: MM or Mm

23. 17. If Hermione had a brother, what is the probability he would be a muggle? MMMm mm MmMm M m Probability of being a muggle: MM or Mm 3 out of 4 or 75%