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Math and Mendel

This lesson focuses on the principles of genetic inheritance using Punnett squares to predict offspring traits. Students will engage in filling out Punnett squares for different parental combinations, identifying the fractions of offspring with dominant, recessive, or mixed genes. Furthermore, students will convert these fractions into decimals and percentages to reinforce their understanding of probability. The lesson will also include an additional component on fractional addition and calculating probabilities regarding parental traits and offspring outcomes.

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Math and Mendel

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  1. Math and Mendel Objectives: Review Genetic Inheritance Learn about converting between fractions, decimals and percentages

  2. Step 1: Fill in the following punett squares Father B b Father B B Father b b Mother b B Mother b B Mother b B

  3. Father B b Father B B Father b b Mother B B Mother B B Mother B B

  4. Father B b Father B B Father b b Mother b b Mother b b Mother b b

  5. Step 1: For each of the punett squares, find the fraction of offspring that will have only dominant, only recessive, and both recessive and dominant genes 1 Only dominant 4 Father B b 1 Only recessive 4 Mother b B 2 Recessive and dominant 4

  6. Father B B Only dominant 4 Mother b B Only recessive 4 Recessive and dominant 4

  7. Father b b Only dominant 4 Mother b B Only recessive 4 Recessive and dominant 4

  8. Father B b Only dominant 4 Mother B B Only recessive 4 Recessive and dominant 4

  9. Father B B Only dominant 4 Mother B B Only recessive 4 Recessive and dominant 4

  10. Father b b Only dominant 4 Mother B B Only recessive 4 Recessive and dominant 4

  11. Father B b Only dominant 4 Mother b b Only recessive 4 Recessive and dominant 4

  12. Father B B Only dominant 4 Mother b b Only recessive 4 Recessive and dominant 4

  13. Father b b Only dominant 4 Mother b B Only recessive 4 Recessive and dominant 4

  14. Step 3: For each of the punett squares convert the fractions into decimals then into percentages 1 Father B b Only dominant = .25 = 25% 4 1 Only recessive = .25 = 25% Mother b B 4 2 Recessive and dominant = .5 = 50% 4

  15. 2 Father B B Only dominant 4 0 Mother b B Only recessive 4 2 Recessive and dominant 4

  16. 0 Father b b Only dominant 4 2 Mother b B Only recessive 4 2 Recessive and dominant 4

  17. 2 Father B b Only dominant 4 0 Mother B B Only recessive 4 2 Recessive and dominant 4

  18. 4 Father B B Only dominant 4 0 Mother B B Only recessive 4 0 Recessive and dominant 4

  19. 0 Father b b Only dominant 4 0 Mother B B Only recessive 4 4 Recessive and dominant 4

  20. 0 Father B b Only dominant 4 2 Mother b b Only recessive 4 2 Recessive and dominant 4

  21. 0 Father B B Only dominant 4 0 Mother b b Only recessive 4 4 Recessive and dominant 4

  22. 0 Father b b Only dominant 4 4 Mother b b Only recessive 4 0 Recessive and dominant 4

  23. Additional Material • In order to teach fractional addition along with conversion: • Add up all the fractions for each of the three cases • Then, find the decimals and percentages from the totals • Further fractions can be created by calculating what the chances are that a particular parent will have a particular offspring

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