Name __________________________
MONOHYBRID CROSS PRACTICE I
Period ____ Date ________ Seat ____
Refer to table A for the following questions.
1. Write the genotype of a homozygous purple flower.
Table A
Gene
(character)
Flower color
Allele
(trait)
Purple
White
Axial
Terminal
Yellow
Green
Round
Wrinkled
Inflated
Constricted
Green
Yellow
Tall
Dwarf
2. Write the genotype of a heterozygous inflated pod.
Flower position
3. Write the genotype of a homozygous dwarf plant.
Seed color
Seed shape
4. Write the genotype of a homozygous wrinkled seed.
Pod shape
Pod color
5. Write the genotype of a heterozygous green pod.
Stem length
Symbol
6. Write the genotype of a homozygous terminal pea plant.
7. Write the genotype of a heterozygous yellow seed.
Figure A
8. Write the genotype of a homozygous white flower.
Axial plant
9. Name two different alleles that express pod shape.
Figure B
10. Name two traits for the character of stem length.
11. What are the possible genotypes of the axial plant
shown in Figure A?
Wrinkled seed
Figure C
12. What are the possible genotypes of the wrinkled
seed shown in Figure B?
13. What are the possible genotypes of the constricted
pod shown in Figure C?
1
Constricted pod
P
p
A
a
Y
y
R
r
I
i
G
g
T
t
MONOHYBRID CROSS PRACTICE I
Describe the phenotype and draw a colored picture of the following genotypes:
14.
Genotype = Pp
15.
Genotype = Tt
Colored illustration:
Description:
Colored illustration:
Description:
17.
16.
Genotype = aa
Genotype = ii
Colored illustration:
Colored illustration:
Description:
Description:
________ x ________
18. Complete the Punnett square of a monohybrid cross
for stem length between a homozygous recessive
plant ( ♀) and a heterozygous plant (♂).
sperm
P
F1
The following questions pertain to the Punnett square
completed in question 18.
eggs
19. What percent of the F1 offspring is homozygous
tall?________ Homozygous dwarf? _________
20. What percent of the F1 offspring is heterozygous? ________
21. In the space to the right, draw and color a pea plant
that is heterozygous for flower position and flower
color and homozygous recessive for stem length.
22. Write the genotype of the pea plant drawn in problem 21.
Dirt
2
Legend