Name ______________________________________________
Date ___________
Vocabulary
Match the definitions on the left with the terms on the right.
____ 1. genotypes made of the same alleles
____ 2. different forms of genes for a single trait
____ 3. gene that is always expressed
____ 4. gene that is expressed only in the homozygous state
____ 5. genotypes made of two different alleles
A. alleles
B. dominant
C. heterozygous
D. homozygous
E. recessive
Below each of the following words are choices. Circle the choices that are examples of each of those words.
6. Dominant allele
D
e
k
L
N
n
R
S
7. Recessive allele
M
n
d
F
G
r
k
P
8. Homozygous dominant
AA
Gg
KK
mm
uu
Rr
TT
9. Homozygous recessive
ee
Ff
HH
Oo
qq
Uu
ww
10. Genotypes in which dominant gene must show
AA
Dd
EE
ff
Jj
RR
Ss
11. Genotypes in which recessive gene must show
aa
Gg
Ff
KK
rr
Oo
Tt
Punnett Squares
12. Examine the following Punnett squares and
circle those that are correct.
13. What do the letters on the outside of the Punnett
square stand for? . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
14. What do the letters on the inside of the Punnett
square stand for? . . . . . . . . . . . . . . . . . . .
Monohybrid Mice!
Directions: Solve each problem showing your work in the Punnett square. For each cross, give the genotypes and phenotypes of the
offspring and the probability of getting each. List these in the table seen by each problem. Answer the questions that accompany
each problem.
What you need to know about the mice: In laboratory mice, gray coat color (G) is dominant over albino coat color. (g).
I. Cross a female Gg with a male gg.
___________1. What is the probability of getting gray offspring?
___________2. What is the probability of getting albino offspring?
___________3. How many possible genotypes are there among the offspring?
___________4. How many possible phenotypes are there among the offspring?
___________5. What is the probability of getting heterozygous offspring?
___________6. What is the probability of getting homozygous offspring?
___________7. What color is the female?
___________8. What color is the male?
II. Cross a homozygous gray female with a heterozygous male.
___________1. What is the probability of getting gray offspring?
___________2. What is the probability of getting albino offspring?
___________3. How many possible genotypes are there among the offspring?
___________4. How many possible phenotypes are there among the offspring?
___________5. What is the probability of getting heterozygous offspring?
___________6. What is the probability of getting homozygous offspring?
___________7. What is the genotype of the female?
___________8. What color is the male?