Genetics Practice Problems
1. For each genotype, indicate whether it is heterozygous (A) or homozygous (B).
AA Bb Cc Dd
Ee ff GG HH
Jj kk Ll Mm
nn OO Pp
2. For each of the genotypes below, determine the phenotype.
A) Purple flowers are dominant to white flowers
QQ
Qq
qq
B) Brown eyes are dominant to blue eyes
BB Bb bb
C) Round seeds are dominant to wrinkled
RR
Rr
rr
D) Bobtails are recessive (long tails dominant)
TT Tt tt
3. For each phenotype, list the genotypes. (Use the letter of the dominant trait)
Straight hair is dominant to curly. straight straight curly
Pointed heads are dominant to round heads. pointed
pointed
round
4. Set up the Punnett square for each of the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive).
A) Rr x rr
B) Rr x Rr
C) RR x Rr
What percentage of the offspring will be round?
%
What percentage of the offspring will be round?
%
What percentage of the offspring will be round?
%
5. Practice with crosses and Punnett squares. Show all work!
A) A TT (tall) plant is crossed with a tt (short plant). What percentage of the
offspring will be tall?
B) A Tt plant is
crossed with a Tt plant. What percentage of the offspring will be short?
C) A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)?
D) is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? What percentage of the offspring
will also be homozygous?
E) In pea plants yellow flowers
are dominant to white flowers.
If two white flowered plants are crossed, what percentage of their offspring will be white flowered?
F) A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have yellow flowers?
G) Two plants, both heterozygous for
the gene that controls flower color
are crossed. What percentage of
their offspring will have yellow flowers? What percentage will have white flowers?
H) In guinea pigs, the allele for long hair is dominant.
What genotype would a heterozygous longhaired guinea pig have?
What genotype would a pure breeding longhaired guinea pig have? What genotype would a shorthaired guinea pig have?
I) Show the cross for a pure breeding longhaired guinea pig and a shorthaired guinea pig. What percentage of the offspring will have long hair?
J) Show the cross for two heterozygous guinea pigs. What percentage of the offspring will have long hair?
What percentage of the offspring will have short hair?
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Genetics Practice Problems
1. For each genotype, indicate whether it is heterozygous (A) or ho...
1. For each genotype, indicate whether it is heterozygous (A) or ho...
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