Genetics Worksheet
Name___________________
Section A: Vocabulary
1. Identify if the alleles are homozygous (Ho) or heterozygous (He).
a. DD ______
c. Yy ______
e. Ee ______
b. Tt ______
d. hh ______
f. KK ______
2. For each genotype below, determine the phenotype.
a. White fur is recessive to black fur.
BB _____________
b. Bb _____________
c. bb _____________
b. Purple flowers are dominant to white flowers.
PP _____________
b. Pp _____________
c. pp _____________
3. For each phenotype, identify the genotype.
a. Brown eyes are dominant to blue eyes. What are the possible alleles if you have brown eyes?
____________ What are the possible alleles if you have blue eyes? ____________
b. Curly hair is dominant to straight hair. What are the possible alleles if you have curly hair?
____________ What are the possible alleles if you have straight hair? ___________
4. Fill in the chart with the missing information.
A = apple shaped head
R = right handed
a = dome shaped head
r = left handed
Genotype Phenotype
Homozygous Heterozygous
AA
Apple shaped
head
Dome shaped
head
Rr
rr
5. Fill in the missing vocab based on the definition below.
a. ____________________ allele from that is only seen when it is homozygous
b. ____________________ alternative versions of genes
c. ____________________ these alleles are the same
d. ____________________ these alleles are different
e. ____________________ another name for homozygous
f.
____________________ the physical appearance of a trait
g. ____________________ an organisms alleles
Section B: Monohybrid Crosses
1. Round seeds (R) are dominant to wrinkled (r) seeds. Cross a homozygous dominant seed with a
heterozygote.
Parents = _____ x ______
Genotype: ____ % RR ____ % Rr ____ % rr
Phenotype: ____ % round ____% wrinkled
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