Make Punnett Squares to determine the offspring for the following parents. Use
the letter “T” for tall and “t” for short.
Square A-parent 1 is Tt
Parent 2 is Tt
1. Both parents are considered?
2. Their phenotype(s)?
3. Their offspring genotype(s)?
4. Their offspring phenotype(s)?
5. What percent are tall?
6. What percent are short?
Square B-parent 1 is TT
Parent 2 is tt
7.
Both parents are considered?
8. Their phenotype(s)?
9. Their offspring genotype(s)?
10. Their offspring phenotype(s)?
11. What percent are tall?
12. What percent are short?
Square C-parent 1 is Tt
Parent 2 is TT
13. Both parents are considered?
14. Their phenotype(s)?
15. Their offspring genotype(s)?
16. Their offspring phenotype(s)?
17. What percent are tall?
18. What percent are short?
SquareD-parent 1 is Tt
Parent 2 is tt
19. Both parents are considered?
20. Their phenotype(s)?
21. Their offspring genotype(s)?
22. Their offspring phenotype(s)?
23. What percent are tall?
24. What percent are short?
Test Cross Punnett Squares
1 st Test cross
Spotted is the dominant flower trait.
Striped is the recessive flower trait.
25. What are the 2 possible genotypes
for a spotted flower?
26.. What will we cross it with to find which
genotype a spotted flower is?
27. Make a test cross for a spotted flower
and a recessive homozygous flower.
Make all four offspring spotted .
If all the offspring end up showing the
dominant trait the genotype of the parent
spotted flower is?
2nd Test cross
4 nosed alien is dominant trait
2 nosed alien is recessive trait
Problem:
We are trying to figure out
Adam the alien’s genotype.
We know he has 4 noses.
His wife has 2 noses.
They had 4 offspring ½ have
2 noses and ½ have 4 noses.
-Complete the cross test
28.What is the wife’s genotype?
29. How do know her genotype?
30. Knowing that Frank’s phenotype is
dominant tells us that he has at
LEAST 1 ___________________allele?
31. After looking at the offspring, what is
Frank’s genotype?
Incomplete Dominance
RR=red
rr=white
Rr=pink
Combine homozygous red flower with homozygous white flower.
32. ____% or /4 are white
33. ____% or /4 are red
34. ____% or /4 are pink
35. Genotype(s):
36. Phenotype(s):
Now combine 2 of the above offspring.
37. ____ % or /4 are white
38. ____% or /4 are red
39. ____% or /4 are pink
40. Genotype(s):
41. Phenotype(s):
Codominance
Draw and color the following combinations of codominant traits.
Red flower
+
Yellow flower
=
? flower
Draw and color the following combinations of the following codominant traits.
Black pig
+
White pig
=
? pig