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WorksheetsPunnett Square Word Problem Practice
Total questions: 39
Worksheet time: 41mins
Name
Class
Date
1.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
2.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
3.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
4.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair)
a)
50 % Brown Hair and 50% Blond Hair
b)
25 % Brown Hair and 75% Blond Hair
c)
75 % Brown Hair and 25% Blond Hair
d)
0% Brown Hair and 100% Blond Hair
5.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
6.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
7.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
8.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
9.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
10.
Long hair (L) is dominant over short hair (l) in certain rodents. What would be the possible genotype/s of a rodent with long hair? (More than one answer is possible)
a)
Ll
b)
LL
c)
ll
11.
Long hair (L) is dominant over short hair (l) in certain rodents. What would be the possible genotype/s of a rodent with short hair?
a)
Ll
b)
LL
c)
ll
12.
In guinea pigs, smooth coat (S) is dominant over rough coat (s). If an SS guinea pig is crossed with an ss guinea pig, what ratio of guinea pigs in the offspring would you predict?
a)
75% will have smooth coats, and 25% will have rough coats
b)
All offspring will be Ss and have smooth coats
c)
Half the offspring will be SS, and the other half will be ss
d)
All offspring will be Ss and have rough coats
13.
Use a Punnett square of a Bb x Bb cross. B is the factor for brown eyes, and b is the factor for blue eyes. What percent of offspring from these parents will have blue eyes?
a)
25%
b)
50%
c)
0%
d)
100%
14.
In peas, yellow seeds (Y) are dominant over green seeds (y). If a yy plant is crossed with a YY plant, what would the ratio of plants in the offspring predict?
a)
All offspring will be Yy. 100% will be yellow
b)
75% will have yellow seeds (YY, Yy, yY), and 25% will have green seeds (yy)
15.
Use a Punnett square of Bb x Bb cross. B is the factor for brown eyes, and b is the factor for blue eyes. What will be the factors for a blue-eyed person?
a)
Bb
b)
cannot be determined from the information given
c)
BB
d)
bb
16.
Use a Punnett square of Bb x Bb cross. B is the factor for brown eyes, and b is the factor for blue eyes. What color do the parents have?
a)
brown
b)
cannot be determined from the information given
c)
blue
d)
green
17.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
18.
B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
19.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
20.
Evan is a tall, 12 year old boy. He has a scar on his right cheek. He is intelligent and an excellent drummer. Which of his traits did he most likely inherit?
a)
height
b)
the scar
c)
his intelligence
d)
ability to play drums
21.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
22.
The image you see is a mammoth. Which trait most suggests that the mammoth was adapted to live in a cold climate?
a)
its thick, furry coat
b)
its long, flexible trunk
c)
its sharp, curved tusks
d)
its broad, powerful body
23.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
24.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
25.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
26.
In the punnett square shown, what is the genotypes of the two parents?
a)
RW and RR
b)
RW and WW
c)
RR and WW
d)
RW and RR
27.
Which of the following is a phenotype?
a)
Aa
b)
black hair
c)
heterozygous genes
d)
mutated DNA
28.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
29.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
30.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
31.
The dominant trait as seen in this punnett square is
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
32.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
33.
What percent of offspring will have the recessive trait?
a)
25
b)
50
c)
75
d)
100
34.
How do two purple flowers produce white flower offspring?
a)
They cant have white flowered offspring
b)
Both flowers are heterozygous and can pass on the white allele
c)
They are both homozygous Dominant
d)
They do not have the recessive allele in their genotype
35.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
36.
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
37.
Two heterozygous red flowers (white flowers are recessive) are crossed. What is the phenotype of the offspring?
a)
50% red; 50% white
b)
75% white; 25% red
c)
25% red; 25% pink; 50% white
d)
75% red; 25% white
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.
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
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