WorksheetsPunnett Squares
Total questions: 50
Worksheet time: 1hrs 11mins
Name
Class
Date
1.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
2.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
3.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
4.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
5.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
6.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
7.
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
8.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
9.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
10.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
11.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
12.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
13.
Which of the characteristics is a lion least likely to pass on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
14.
In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?
a)
0%
b)
25%
c)
50%
d)
75%
15.
Which of the following is NOT a genotype?
a)
heterozygous
b)
a trait
c)
Bb
d)
homozygous recessive
16.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
17.
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
18.
AA and Aa always show up as
a)
dominant
b)
recessive
19.
aa always shows up as
a)
dominant
b)
recessive
20.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
21.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender
d)
all of the above
22.
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
23.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
24.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
25.
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%
26.
Curly hair is dominant to straight hair.
Two straight hair individuals are crossed. What will be the phenotypes of the offspring?
Two straight hair individuals are crossed. What will be the phenotypes of the offspring?
a)
100% straight
b)
50% straight; 50% curly
c)
75% curly; 25% straight
d)
100% curly
27.
Straight hair is dominant to curly hair.
Which parents will give a 25% chance of having offspring with curly hair?
Which parents will give a 25% chance of having offspring with curly hair?
a)
2 heterozygous straight hair (Tt)
b)
2 homozygous straight hair (TT)
c)
1 homzygous curly (tt) and 1 homzygous straight (TT)
d)
1 heterozygous straight (Tt) and 1 homozgyous curly (tt)
28.
Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.
a)
homozygous or purebred
b)
heterozygous or hybrid
c)
twin offspring
d)
pairs of chromosomes
29.
What characteristic would a child NOT inherit from parents?
a)
freckles
b)
eye color
c)
hair style
d)
dimples
30.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
31.
Where is DNA in a eukaryotic cell?
a)
Cytoplasm
b)
Cell membrane
c)
Nucleus
d)
Vacuole
32.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
33.
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
34.
T = tall an t = short
TT and Tt would result in the following phenotype
TT and Tt would result in the following phenotype
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
35.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
36.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Justin Bieber
37.
The scientific study of heredity is ____.
a)
Genetics
b)
Punnett squares
c)
Inheritance
d)
Biology
38.
If one stronger trait "covers" up another weaker trait, the trait that covers the other is said to be:
a)
Dominant
b)
Heterozygous
c)
Recessive
d)
Hidden
39.
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%
40.
Purple (P) is dominant to the 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%
41.
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
42.
What genotype would go in box 2?
a)
BB
b)
Bb
c)
bb
43.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
44.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
45.
What is the probability of homozygous dominant offspring?
a)
0%
b)
100%
c)
50%
d)
25%
46.
What is the probability of homozygous recessive offspring?
a)
0%
b)
100%
c)
50%
d)
25%
47.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
48.
Stuart Snail is heterozygous for tall eyeballs. Sally Snail has tall eyeballs but does carry the recessive allele. What are the chances that their baby snail would have short eyeballs?
a)
75%
b)
50%
c)
25%
d)
0%
49.
George Guinea Pig met Greta Guinea Pig at a party. George is heterozygous for his long hair, but Greta has short hair. How can we describe Greta's genotype?
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
50.
I have this genetics stuff under control.
a)
No, I have no idea what Genetics is.
b)
Yes, I know Genetics is what makes me, me.
100 %
