GENETICS
PROBLEMS
T
R
G
P
Key to Pea Plant Genes and Traits
Dominant
Recessive
Tall Plants
t
Short Plants
Round Peas
r
Wrinkled Peas
Green Leaves
g
Yellow Leaves
Purple Flowers
p
White Flowers
1. What will the phenotype be for each set of genes listed below?
Sample: Gg
Answer: Green leaves (since Gg is dominant)
A) Tt
B) Pp
C) rr
D) GG
E) pp
F) Gg
G) gg
H) Rr
I) TTgg
J) RrPp
K) ttRr
L) TTRrggPp
2. What will the genotype be for:
Sample: a heterozygous green-leaved plant?
Answer: Gg (both different)
A) a homozygous wrinkled pea plant?
B) a heterozygous purple-flowered plant?
C) a homozygous purple-flowered plant?
D) a heterozygous tall plant
E) a heterozygous round pea plant
F) a heterozygous tall plant that is
homozygous for green leaves
3. Which genotypes below are produced by mitosis? By meiosis?
4.
5.
6.
7.
8.
A) Gg
B) gg
C) G
Can 2 homozygous yellow-leaved plants produce a green-leaved plant? Prove your answer.
What are the 2 alleles for pea flower color?
What are the 2 alleles for pea shape?
Use a Punnett Square (Genetic Checkerboard) to predict what percentage of the offspring
will have white flowers from each mating below:
A) PP x pp
B) Pp x pp
C) Pp x Pp
D) pp x pp
Predict the result of breeding 2 heterozygous round pea plants together.
Use a Punnett Square to solve.
9. Predict the result of breeding 2 homozygous round pea plants together.
Use a Punnett Square to solve.
10. If 2 heterozygous green-leaved plants are bred together, what percent of the offspring should
have the dominant trait?
11. If breeding 2 orange trees with seeds together results in offspring in which 25% have
seedless oranges, then what will you get if you breed 2 trees with seedless oranges
together?
12. Are you ready for a Challenge?
Use a Punnett Square to predict out what the offspring of breeding these pea plants will
look like?
A) TTgg x ttGG
B) Rrgg x rrGg
C) TtGg x ttgg
D) TtGg x TtGg