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WorksheetsPunnett Squares!
Total questions: 42
Worksheet time: 49mins
Name
Class
Date
1.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
Short = S
b)
Tall = T
Short = t
Short = t
c)
Tall = t
Short = T
Short = T
d)
Tall = TT
Short = tt
Short = tt
2.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
3.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
4.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
5.
Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have?
a)
Red
b)
Blue
c)
Purple
d)
50% Red, 50% Blue
6.
Leonardo bet his friend Olivet that two heterozygous green-eyed sea monsters could not have a recessive blue-eyed baby sea monster. Olivet said they can have a blue-eyed sea monster.
Who wins the bet?
Who wins the bet?
a)
Leonardo
b)
Olivet
c)
Both
d)
Neither
7.
A brown-furred ewok has 12 babies with a black-furred ewok. 9 ewok babies have black fur, while 3 ewok babies have brown fur. What are the probable genotypes of the parents?
a)
BB and bb
b)
BB and Bb
c)
Bb and Bb
d)
Bb and bb
8.
Jabba the Hutt has finally decided to settle down and have a family. He has undergone genetic testing and learned that he is heterozygous for Hutt Fungal Syndrome, which is caused by recessive alleles. He is worried that his children might suffer from this syndrome. His Hutt mate has undergone genetic testing and discovered she is homozygous dominant for the syndrome. Should Jabba be worried?
a)
Yes
b)
No
9.
A Jawa notices that his beloved pet desert rat, who has brown fur, just had several rat babies, some of which had white fur and some which had brown fur. Brown fur is the dominant trait. This means his rat must have what genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
10.
Bob the abominable snowman lives in the snowy Andes mountains. He has white fur, which blends in nicely. He is therefore dismayed when his mate keeps having red-furred babies. What is Bob's likely genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
11.
Identify the homozygous dominant genotype:
a)
FF
b)
Ff
c)
ff
12.
What phenotype would result from crossing a homozygous dominant purple-flowered pea plant with a homozygous recessive white-flowered pea plant?
a)
Pp
b)
Purple
c)
White
d)
PP and pp
13.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
14.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
15.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
16.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
17.
B = brown eyes
b = blue eyes
One brother has genotype BB and the other brother has genotype Bb.
Which statement is true about these two brothers?
a)
They have same phenotype and genotype
b)
They have different phenotypes and genotypes
c)
They have same phenotype, but different genotypes
d)
They have different phenotypes, but the same genotype
18.
The genotype Aa is called . . .
a)
Homozygous recessive
b)
Hybrid
c)
Purebred
d)
Homozygous dominant
19.
Which of the following would be a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
20.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
21.
Which of the following genotypes is homozygous dominant?
a)
Yy
b)
yY
c)
yy
d)
YY
22.
Which of the following genotypes is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
tT
23.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?
a)
rr
b)
rR
c)
RR
d)
Rr
24.
Which of these characteristics would not be passed on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
25.
What is the genotypic ratio of the offspring?
a)
3:1
b)
1:3
c)
1:2:1
d)
2:2
26.
How many alleles (letters) does a child get from EACH parent for each trait?
a)
1
b)
2
c)
3
d)
4
27.
What are the phenotype percentages of the offspring?
(A-Brown fur color; a-white fur color)
a)
50 % Brown fur and 50% White fur
b)
25 % Brown fur and 75% White fur
c)
75 % Brown fur and 25% White fur
d)
0% Brown fur and 100% White fur
28.
A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring. (Be sure to remember that the capital letter is dominant).
a)
50% heterozygous and 25% homozygous recessive
b)
50% heterozygous and 50% homozygous recessive
c)
100% homozygous recessive
d)
25% heterozygous and 50% homozygous
29.
A tall plant (Tt) is crossed with a short plant (tt). What is the genotype of the offspring?
a)
25% heterozygous; 75% homozygous
b)
100% homozygous dominant
c)
100% heterozygous
d)
50% heterozygous; 50% homozygous dominant
30.
A tall plant (Tt) is crossed with a short plant (tt). What is the phenotype of the offspring?
a)
75% tall; 25% short
b)
25% tall; 75% short
c)
50% tall; 50% short
d)
100% tall
31.
A white flower (rr) is crossed with a white flower (rr). What is the genotype of the offspring? Draw a Punnett square and answer the question.
a)
100% homozygous dominant
b)
100% heterozygous dominant
c)
100% homozygous recessive
d)
100% heterozygous recessive
32.
A white flower (rr) is crossed with a white flower (rr). What is the phenotype of the offspring? Draw a Punnett square and answer the question.
a)
100% white
b)
75% white; 25% red
c)
75% red; 25% white
d)
100% red
33.
A black chicken (BB) is crossed with a black chicken (BB). What is the genotype and phenotype of the offspring? Draw a Punnet square and naswer this question.
a)
100% heterozygous; 50% black
b)
100% homozygous dominant; 100% black
34.
A red flower (Rd) is crossed with a white flower (rr). What is the genotype of the offspring? Draw a Punnett square and answer this question.
a)
50% heterozygous; 50% homozygous dominant
b)
100% homozygous dominant
c)
100% homozygous recessive
d)
50% heterozygous; 50% homozygous recessive
35.
A homozygous dominant brown mouse (BB) is crossed with a heterozygous brown mouse (tan is the recessive color). List the offspring genotype and phenotype.
a)
50% homozygous dominant; 50% heterozygous and 100% tan
b)
25% homozygous dominant; 75% heterozygous; 100% brown
c)
50% homozygous dominant; 50% heterozygous and 100% brown
d)
75% homozygous dominant; 25% heterozygous and 100% tan
36.
Two heterozygous white (brown fur is recessive) rabbits are crossed. What is their genotype?
a)
25% homozygous domestic; 25% homozygous recessive; 50% heterozygous
b)
50% homozygous dominant; 50% heterozygous
c)
25% homozygous domestic; 75% homozygous recessive
37.
Two heterozygous white(brown fur is recessive) rabbits are crossed. What is the phenotype of the offspring?
a)
75% white; 25% brown
b)
25% white; 75 % brown
38.
Two heterozygous red flowers (white flowers are recessive) are crossed. What is the genotype of the offspring?
a)
75% homozygous dominant; 25% heterozygous
b)
50% homozygous dominant; 50% heterozygous
c)
25% homozygous dominant; 25% homozygous recessive; 50% heterozygous
39.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
40.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
41.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
42.
In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.
Complete a cross between A speckled flower and a red flower. Find the phenotype ratio.
Complete a cross between A speckled flower and a red flower. Find the phenotype ratio.
a)
2 red: 2 speckled: 0 white
b)
4 red: 0 speckled: 0 white
c)
0 red: 4 speckled: 0 white
d)
0 red: 2 speckled: 2 white
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