1. Tuesday Bell Work
32. Which of the following is an appropriate cross of a heterozygous white bird with a blue one, and why? Choose the answer that makes the most sense to you and explain why.
Bb X bb E. Bb X Ww
BB X Bb F. BB X WW
Ww X ww G. Bb X WW
WW X Ww H. Ww X bb

2. Using Punnett Squares
Comans Science

3. How to Do a Punnett Square
Let’s say you get a question like this: Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered? How can you use a Punnett square to answer such a complicated question?

4. How to Do a Punnett Square
Assign a key (what letters you will use).
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?

5. How to Do a Punnett Square
Assign a key (what letters you will use).
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
We will use a capital letter to represent the dominant trait. What is dominant here?

6. How to Do a Punnett Square
Assign a key (what letters you will use).
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
P = Purple (dominant)
p = White (recessive)

7. How to Do a Punnett Square
Assign a key (what letters you will use).
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
Since both have one of each allele, and both are purple, purple is dominant.

8. How to Do a Punnett Square
Set up the cross.
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
Again, we’ve got one of each allele for each.

9. How to Do a Punnett Square
Set up the cross.
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
Pp X Pp

10. How to Do a Punnett Square
Separate Alleles (set up the Punnett square)
Pp X Pp

11. How to Do a Punnett Square
Separate Alleles (set up the Punnett square)
Pp X Pp P p P p

12. How to Do a Punnett Square
Separate Alleles (set up the Punnett square)
Pp X Pp P p P p

13. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P p

14. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P PP p

15. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P PP Pp p

16. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P PP Pp p Pp

17. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P PP Pp p Pp pp

18. How to Do a Punnett Square
Fill in the Punnett square
Pp X Pp P p P PP Pp p Pp pp

19. How to Do a Punnett Square
List all the genotypes possible (letter combinations in the square) P p P PP Pp
PP = 25% p Pp pp

20. How to Do a Punnett Square
List all the genotypes possible (letter combinations in the square) P p P PP Pp
PP = 25%
Pp = 50% p Pp pp

21. How to Do a Punnett Square
List all the genotypes possible (letter combinations in the square) P p P PP Pp
PP = 25%
Pp = 50% p Pp pp
pp = 25%

22. How to Do a Punnett Square
List all the phenotypes possible (put the genotypes into word description)
PP =
Purple
Pp =
Purple
pp =
White

23. How to Do a Punnett Square
Give ratio or percent or fraction for each
PP = 25%, Purple
Pp = 50%, Purple
pp = 25%, White
What are the chances for a Purple flower?
75%

24. How to Do a Punnett Square
Give ratio or percent or fraction for each
PP = 25%, Purple
Pp = 50%, Purple
pp = 25%, White
What are the chances for a White flower?
25%

25. How to Do a Punnett Square
Go back, read your question, and answer any specific questions
Mendel crossed two heterozygous purple flowered pea plants. What percent of offspring are white flowered?
25%

26. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
Assign a key (what letters you will use).
L = Lop-eared (dominant)
l = Straight-eared (recessive)

27. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
Set up the cross.
Ll X Ll

28. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears? 3. Separate Alleles (set up the Punnett square). L l L l

29. L l L LL Ll l Ll ll Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
Fill in the Punnett square L l L LL Ll l Ll ll

30. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
List all the genotypes possible (letter combinations in the square)
LL (25%)
Ll (50%)
ll (25%)

31. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
List all the phenotypes possible (put the genotypes into word description)
LL = Lop-eared
Ll = Lop-eared
ll = Straight-eared

32. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
Give ratio or percent or fraction for each
LL = Lop-eared = 25%
Ll = Lop-eared = 50%
ll = Straight-eared = 25%

33. Self-Check #1
A rabbit breeder crossed a lop eared rabbit (Ll) with another lop eared rabbit (Ll). What ratio of offspring have straight ears?
Go back, read your question, and answer any specific questions
1:3

34. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
Assign a key (what letters you will use).
F = Fat tailed (dominant)
f = Slender tailed (recessive)

35. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
Set up the cross.
FF X ff

36. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails? 3. Separate Alleles (set up the Punnett square). F F f f

37. F F f Ff Ff f Ff Ff Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
Fill in the Punnett square F F f Ff Ff f Ff Ff

38. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
List all the genotypes possible (letter combinations in the square)
Ff (100%)

39. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
List all the phenotypes possible (put the genotypes into word description)
Ff = Fat tailed

40. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
Give ratio or percent or fraction for each
Ff = Fat tailed (100%)

41. Self-Check #2
A herpetologist crossed a homozygous fat tailed gecko with a recessive slender tailed gecko. What percent of offspring will have slender tails?
Go back, read your question, and answer any specific questions 0%