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Genotype vs. Phenotype Worksheet
Name
1. A genotype is an individual’s
Per.
and is represented by ____ letters.
2. A phenotype is an individual’s
.
3. A variation describes the genotype/phenotype (circle one).
4. An allele refers to the different
of a ____________, and each is represented by ____ (#) letter.
5. If a trait is dominant, it will be expressed when there is/are
allele(s).
6. If a trait is recessive, it will only be expressed when there is/are
allele(s).
7. A cell with 1 allele of each gene is
in its chromosome numbers.
8. A cell with 2 alleles of each gene is
in its chromosome numbers.
Writing Alleles. Write the alleles for each variation of the following traits by using the first letter of the
dominant form.
Trait
Variation
Allele Genotype(s)
Dominant: tall
1
Height
Recessive: short
Dominant: detached ear lobes
2
Ear Lobe Type
3
Thumb Type
4
Flower Color
5
Nose Shape
Recessive: attached ear lobes
Dominant: hitchhiker’s thumb
Recessive: no hitchhiker’s thumb
Dominant: red
Recessive: white
Dominant: bump on nose
Recessive: no bump on nose
Phenotypes
Consider the following alleles:
B = brown eyes
D = brown hair
b = blue eyes
d = blonde hair
G = widow’s peak
g = no widow’s peak
H = long arms
h = short arms
What phenotypes would correspond with the following genotypes?
Genotype
Phenotype
1. BB
2. bb
3. DD
4. Gg
5. hh
6. MMHh
7. BbDd
8. GGhh
9. BbMm
10. BBDdggHhmm
M = can roll tongue
m = cannot roll tongue
Genotypes
Consider the following alleles:
B = brown eyes D = brown hair
b = blue eyes
d = blonde hair
G = widow’s peak
g = no widow’s peak
H = long arms
h = short arms
M = can roll tongue
m = cannot roll tongue
List ALL the POSSIBLE genotypes that would match the following phenotypes.
Genotype
Phenotype
Blue eyes, blonde hair, widow’s peak
1. 

2. 

Blue eyes, brown hair, cannot roll tongue
3. 

4. 



No widow’s peak, cannot roll tongue, long
arms
Brown eyes, brown hair, widow’s peak, long
arms, can roll tongue











5. 
Blue eyes, blonde hair, short arms, cannot
roll tongue, no widow’s peak
Brown hair, blue eyes, widow’s peak
6. 



7. 



Can roll tongue, long arms, no widow’s
peak, blue eyes
8. 

Brown hair, brown eyes, no widow’s peak


9. 

Short arms, blonde hair, brown eyes
10. 



Widow’s peak, blue eyes, short arms, can
roll tongue