Breeding Larkeys 4/2/08

1. Breeding Larkeys 4/2/08 • Add entry to your table of contents • Glue in the data table, your entry should look like this...

2. ♀ P Female

3. ♂ P Male

7. Larkey Breeding • Start with the female parent larkey. Using her genotype (cup with 8 tiles) on the left hand circle. • Without looking pull one tile from her cup. Place the tile in the proper place in the left column of the mat. • Randomly draw another tile and place it in the proper place. If it is the same letter as the first, put it back and draw again. • Continue until all four alleles have been placed. • Repeat for the male parent larkey.

8. Larkey Breeding cont. • You have now created the egg and sperm from the parents. • Move the two columns of tiles to the center, to model sexual reproduction/fertilization. This is the newly created offspring cell that will grow up to be a new female larkey. • Record the genotype of the new female offspring (F1 generation) on your larkey chart. • Replace the tiles into the appropriate parent gene cup. • Repeat steps 1-10 for your new male offspring.

9. ♀ F1 Female

10. ♂ F1 Male

11. Thursday, April 3, 2008 • Agenda: • Genetics Response sheet (taped in and done in logbook) due 4/4 • You need: • pencil, lab tub and log book • To do: • Open logbook to Larkey Breeding

12. The F1 generation larkeys are all genetically the same – they all have the same genotype and they all look the same. None of them has long legs, gray eyes, bare tails, striped or spotted fur. Does this mean that these five traits are forever gone from this yammer of larkeys? What will the F2 generation look like?

13. Period 2

14. Period 3

15. Period 4

17. Period 2

18. Period 3

19. Period 4

20. The F1 generation larkeys are all genetically the same – they all have the same genotype and they all look the same. None of them has long legs, gray eyes, bare tails, striped or spotted fur. Does this mean that these five traits are forever gone from this yammer of larkeys? What will the F2 generation look like?

22. ♀ F1 Female

23. ♂ F1 Male

25. Larkey Breeding • Start with the female F1 larkey. Using her genotype (cup with 8 tiles) on the left hand circle. • Without looking pull one tile from her cup. Place the tile in the proper place in the left column of the mat. • Randomly draw another tile and place it in the proper place. If it is the same letter as the first, put it back and draw again. • Continue until all four alleles have been placed. • Repeat for the male parent larkey.

26. Larkey Breeding cont. • You have now created the egg and sperm from the parents. • Move the two columns of tiles to the center, to model sexual reproduction/fertilization. This is the newly created offspring cell that will grow up to be a new female larkey. • Record the genotype of the new male offspring (F2 generation) on your larkey chart. • Replace the tiles into the appropriate parent gene cup. • Repeat steps 1-10 for your new female offspring.

27. Period 2

28. Period 3

29. Period 4

30. Parent Generation 1. What patterns in the traits do you see in the Parent Generation?

31. F1 Generation • What patterns in the traits do you see in the F1 Generation? • How do the genotypes of F1 generation compare to the Parent Generation? • Are most of the missing traits in the F1 generation dominant or recessive? Why do you think that happened? • How does the F1 genotype for the fur pattern compare to the other three F1 genotypes? 6. Why didn’t the Larkeys end up with the dominant trait of striped fur?

32. F2 Generation • What were your predictions for F2 generation? Did those predictions match the results? Why or why not? • How did the number of dominant and recessive traits compare in F2? 9. Why did the recessive traits re-appear?