Name _____________________________Date _______________ Period _______
Directions: Using the data in Table 1, write the genotype that corresponds to the phenotype
descriptions
Table 1: Mendel's Traits and Symbols for Pea Plants
Traits
Dominant Allele
Symbol
Recessive Allele
Seed Shape
Round
R
Wrinkled
Seed Color
Yellow
Y
Green
Seed Coat Color
Colored
C
White
Pod Shape
Smooth
S
Constricted
Pod Color
Green
G
Yellow
Stem Height
Tall
T
Short
Flower Position
Axial
A
Terminal
Phenotype
Genotype
Phenotype
1. Heterozygous for height
16. Constricted pod
2. Homozygous dominant for seed shape
17. Short height
3. Heterozygous colored seed coat
18. Green seed color
4. Homozygous green pod
19. Terminal flowers
5. Homozygous short
20. Pure wrinkled
6. Homozygous tall
21. Hybrid tall
7. Homozygous axial
22. Pure round
8. Homozygous terminal
23. Yellow seed pod
9. Heterozygous flower position
24. Hybrid smooth
10. Heterozygous seed color
25. Pure smooth pod
11. Homozygous smooth pod
26. Hybrid pod color
12. Homozygous constricted pod
27. White seed coat
13. Homozygous recessive for seed coat color
28. Wrinkled seed
14. Heterozygous for pod color
29. Pure colored seed coat
15. Homozygous round seed
30. Hybrid flower position
Symbol
r
y
c
s
g
t
a
Genotype
31. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho)
AA_____
Ee_____
Ii_____
Mm_____
Pp_____
Bb_____
ff_____
Jj_____
nn_____
LL_____
Cc_____
Gg_____
kk_____
oo_____
HH_____
32. For each of the genotypes below determine what phenotypes would be possible.
Purple flowers are dominant to white flowers
Brown eyes are dominant to blue eyes
PP_____________________________
BB_________________________
Pp_____________________________
Bb_________________________
pp_____________________________
bb_________________________
Round seeds are dominant to wrinkled seeds
Bobtails in cats are recessive
RR_____________________________
TT_________________________
Rr_____________________________
Tt_________________________
rr_____________________________
tt_________________________
33. For each phenotype below, list the possible genotypes (remember to use the letter of the dominant trait)
Straight hair is dominant to curly
Pointed heads are dominant to round heads
__________ Straight
__________ Pointed
__________ Straight
__________ Pointed
__________ Curly
__________ Round
34. Set up the Punnett squares for each of the crosses listed below.
Round seeds are dominant to wrinkled seeds.
Rr x rr
What percentage of the offspring will be round?_______
RR x rr
What percentage of the offspring will be round?_______
Rr x Rr
What percentage of the offspring will be round?______
Practice with Crosses. Show all work!
35. A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall? ___________
36. A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short? ______
37. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes
of the parents? _________ x ________. What percentage of the offspring will also be homozygous? ___________
38. Two plants, both heterozygous for the gene that controls flower color are crossed. What percentage of their
offspring will have purple flowers? ____________ What percentage will have white flowers? ___________