Name:___________________________________Date/Period:________________ Genetics:Get Squared Away
1. How many alleles for a trait does each parent carry?
2. A man is homozygous recessive for a trait that causes crazy, wavy hair. A woman is homozygous
dominant for the same trait and thus has straight, normal hair.
a. If H is used to indicate the dominant allele, what is the genotype of the man and the woman?
Male Genotype: _______
Female Genotype: ______
b. What are the possible genotypes of offspring this couple could produce?
c. If a child of this couple is heterozygous, what type of hair will he or she have?
3. What is a Punnett Square? What is a Punnett Square used for?
4. Complete the Punnett Square below.
A
A
A
AA
a
Aa
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
5.
b
b
B
B
6.
G
G
g
g
Name:___________________________________Date/Period:________________ Genetics:Get Squared Away
7.
H
h
h
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
h
8. Complete the Punnett Square below.
Q
q
Q
Q
9.
Rr x rr
10. EE x ee
11. ff x Ff
Name:___________________________________Date/Period:________________ Genetics:Get Squared Away
12. Gg x gg
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
Homozygous Dominant_____/
Heterozygous
_____/
Homozygous recessive _____/
=
=
=
%
%
%
13. Aa x Aa
14. Qq x QQ
15. Vv x Vv
16. KK x KK
Name:___________________________________Date/Period:________________ Genetics:Get Squared Away
17. Predict the probability of the occurrence of tall pea plants from a monohybrid cross between
heterozygous tall pea plants.
T
t
a. 1/4
b. 1/2
c. 3/4
T
d. 1.0
t
18. Using the cross above, what is the probability of having short pea plants?
a. 1/4
b. 1/2
c. 3/4
d. 1.0
19. If a homozygous dominant individual (JJ) is crossed with a homozygous recessive individual (jj), what
is the probability of having a heterozygous offspring?
a. 0/4
b. 1/4
c. 3/4
d. 4/4
20. Which genetic cross will give you the least phenotypic and genotypic variation?
a. RR and rr
b. Rr and rr
c. RR and Rr
d. Rr and Rr