1. Single-Factor Punnett Square Notes

2. Punnett Square A diagram that can be used to predict the gene combinations that might result from a cross

3. Basic Problems: T = Tall t = short Tt x TT

4. T t T T Tt

5. T tT t T T Tt TT: Tt : tt Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 2 : 2 : 0 4 : 0

6. Basic Problems: T = Tall t = short Tt x Tt

7. T t T t TT Tt tt

8. T tT t T t TT Tt tt TT: Tt : tt Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 1 : 2 : 1 3 : 1

9. Word Problems A = Axial flowers a = terminal flowers Cross homozygous axial plant with a terminal plant. __________ X _________ AAaa

10. Basic Problems: A = axial a = terminal AA x aa

11. A A a a Aa

12. A AA A a a Aa AA: Aa : aa Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 0 : 4 : 0 4 : 0

13. Word Problems A = Axial flowers a = terminal flowers Cross 2 plants that are heterozygous for axial flowers. __________ X _________ Aa Aa

14. Basic Problems: A = axial a = terminal Aa x Aa

15. A a A a AA Aa aa

16. A aA a A a AA Aa aa AA: Aa : aa Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 1 : 2 : 1 3 : 1

17. Backwards Problems G = Green pods g = yellow pods ¾ of the plants produced by a cross between 2 unknown pea plants have green pods and ¼ have yellow pods. What are the genotypes of the parent plants? __________ X _________

18. G G G gg

19. G g G g G G G gg G g g

20. Parents Genotypes are…. Gg X Gg

21. Backwards Problems G = Green pods g = yellow pods What cross would result in ½ of the offspring having green pods and ½ of the offspring having yellow pods? __________ X _________

22. G G gg

23. G g g g G G g g

24. Parents Genotypes are…. Gg X gg