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WorksheetsPunnett Square
Total questions: 81
Worksheet time: 2hrs 30mins
Name
Class
Date
1.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
2.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
3.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
4.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
5.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
6.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
7.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
8.
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
9.
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
10.
AA and Aa always show up as
a)
dominant
b)
recessive
11.
aa always shows up as
a)
dominant
b)
recessive
12.
Aa is
a)
homozygous
b)
heterozygous
13.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
14.
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
15.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
16.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
17.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
18.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
19.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
20.
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
21.
What is a punnett square?
a)
graph/chart used to predict the possible genotypes of offspring in a given cross
b)
a graph/chart used to predict the possible birth rate of offspring.
c)
a graph/chart used to predict the possible behavioral characteristics an offspring could have
d)
None of the above
22.
In a Punnett square where are the parent alleles written?
a)
Top and inside the boxes
b)
Only on the left and right side of the boxes.
c)
outside of the boxes (top and left side)
d)
All on the top side of the boxes
23.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
24.
AA and Aa always show up as
a)
dominant
b)
recessive
25.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
26.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
27.
Which choice best represents the genotype of this cross?
a)
1 Yy: 2 yy: 0 YY
b)
2 Yy: 2 yy: 0 YY
c)
3 Yy: 1 yy: 0 YY
d)
1 Yy: 3 yy: 0 YY
28.
If you have a male with large wings (DD) and a female with small wings (dd). What allele stands for large wings?
a)
D
b)
d
c)
Dd
d)
dd
29.
A tall plant (TT) is crossed with a tall plant (Tt). What is the genotype?
a)
2 TT: 2 Tt: 0 tt
b)
1 TT: 2 Tt: 1 tt
c)
2 TT: 1 Tt: 1 tt
d)
0 TT: 0 Tt: 4 tt
30.
A green pea plant (GG) is being crossed with a green pea plant (Gg). What is the phenotype?
a)
100 % rainbow
b)
50% yellow and 50% green
c)
100% green
d)
100% yellow
31.
A red flower (Rr) is crossed with a white flower (rr). What is the genotype?
a)
0 RR; 0 Rr: 4 rr
b)
2 RR; 0 Rr: 2 rr
c)
4 RR; 0 Rr: 0 rr
d)
0 RR; 2 Rr: 2 rr
32.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
33.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
34.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
35.
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%
36.
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
37.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
38.
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
39.
If B is the dominant allele for brown hair, and b is for blonde hair
What is the phenotype for Bb?
What is the phenotype for Bb?
a)
Brown Hair
b)
Blonde Hair
c)
Brown and Blonde Hair
d)
Black Hair
40.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
41.
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
42.
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%
43.
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
44.
Recessive alleles may not be expressed because they are
a)
masked by a dominant allele
b)
the least common allele in a population.
c)
the most common allele in a population.
d)
less likely to have crossing over.
45.
Different forms of genes:
a)
alleles
b)
phenotype
c)
genotype
d)
homologous chromosomes
46.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
47.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
48.
Having two of the SAME alleles for a trait (example HH or hh):
a)
homozygous
b)
heterozygous
c)
recessive
d)
dominant
49.
Having two different alleles for a trait (example Hh):
a)
homozygous
b)
heterozygous
c)
dominant
d)
purebred
50.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
BB
51.
R=round seed
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
a)
offspring will be Rr
b)
offspring will be RR
c)
round seeds will be recessive to wrinkled
d)
Wrinkled will be observed in half of offspring
52.
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
53.
Red flower (R) color is dominant to white flower (r) color in rose plants. What is the expected phenotypic results of a cross between two heterozygous (Rr) rose plants?
a)
100% red
b)
75% red, 25% white
c)
50% red, 50% white
d)
75% white, 25% red
54.
Two heterozygous parents produce offspring. What is the probability of the HOMOZYGOUS DOMINANT GENOTYPE appearing in the offspring generation?
a)
75%
b)
25%
c)
50%
d)
100%
55.
People often purposely breed cows that produce more milk that are bigger and/or healthier in hopes of producing offspring (calves) with the same traits. What is this called?
a)
natural selection
b)
genetic engineering
c)
selective breeding
d)
controlled mating
56.
Requires a male & female exchange of genetic material (sperm & egg). Causes greater diversity
a)
natural selection
b)
selective breeding
c)
asexual reproduction
d)
sexual reproduction
57.
A section of the DNA strand that determines a specific trait
a)
gene
b)
trait
c)
chromosome
d)
allele
58.
A type of gene that can be hidden is called
a)
genotype
b)
recessive
c)
dominant
d)
allele
59.
What is the phenotype for the recessive trait?
a)
brown eyes
b)
green eyes
c)
blue eyes
60.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
d)
Heterozygous for blue eyes
61.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
62.
The physical appearance of the allele combination the offspring receives
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
63.
----is the type of gene that always shows itself when present
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
64.
Challenge question: What goes in box 1?
a)
AABb
b)
AABB
c)
aabb
d)
AaBb
65.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
66.
This is an example of ___________.
a)
Incomplete Dominance
b)
Codominance
67.
What type of inheritance do two alleles have if their traits blend together?
a)
Incomplete Dominance
b)
Co-Dominance
68.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
69.
This is an example of ___________.
a)
Incomplete Dominance
b)
Codominance
70.
A tall plant (TT) is crossed with a short plant (SS) and a medium plant (TS) results. This is what type of inheritance pattern?
a)
Incomplete Dominance
b)
Codominance
71.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
72.
If you cross a black chicken with a white chicken, only checkered chickens would be produced. What kind of inheritance pattern does this follow?
a)
incomplete Dominance
b)
Co-Dominance
73.
Which type of inheritance causes both traits to be expressed equally in the heterozygote?
a)
Complete Dominance
b)
Incomplete Dominance
c)
Co-Dominance
d)
Sex-linked
74.
Co-dominance ________________
a)
is a situation in which both alleles are equally strong and both alleles are visible in the hybrid genotype
b)
is a situation in which the dominant allele is stronger than the recessive allele, but both alleles are visible in the hybrid genotype
c)
is a situation in which the recessive alleles are stronger than the dominant allele, within which the recessive alleles are visible in the hybrid genotype
d)
none of the answers are correct.
75.
What type of inheritance do two alleles have if their traits blend together?
a)
Incomplete Dominance
b)
Co-Dominance
c)
Mendelian Inheritance
d)
Homozygous Inheritance
76.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
77.
Cells with pairs of homologous chromosomes, 2n number of chromosomes
a)
diploid
b)
haploid
c)
polyploid
d)
triploid
78.
A trait that does not appear unless the dominant trait is absent
a)
dominant
b)
recessive
c)
co-dominant
d)
incomplete dominant
79.
Occurs when chromosome pairs fail to separate properly during meiosis
a)
phenotype
b)
genotype
c)
karyotype
d)
nondisjunction
80.
Neither allele is completely dominant over the other, so they blend together (red+white=pink)
a)
incomplete dominance
b)
simple dominance
c)
co-dominance
d)
nondisjunction
81.
Two identical alleles (CC or cc)
a)
homozygous
b)
heterozygous
c)
mitosis
d)
meiosis
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