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Punnett Square Review

Total questions: 147

Worksheet time: 3hrs 14mins

Name
Class
Date
1.

Which statement pertains to Mendel's law of segregation?

a)

Two alleles for each trait separate during meiosis.

b)

Homozygous organisms are called hybrids.

c)

Dominant traits are visible.

d)

Allele pairs are called a genotype.

2.

Which of these pertains to Mendel's law of independent assortment?

a)

observable characteristics of a trait

b)

protein production

c)

random distribution of alleles

d)

separation of alleles during meiosis

3.

An organism with the genotype DD for a trait is __. Select all that apply.

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

4.

Which statement is not true of genes located close together on the same chromosome?

a)

They are linked together.

b)

They do not segregate independently.

c)

They travel together during gamete formation.

d)

They always segregate independently.

5.

Which of these statements is not true of inbreeding?

a)

Desired traits can be passed to offspring.

b)

Undesired traits can be eliminated.

c)

Two closely related organisms are bred together.

d)

Harmful recessive traits can never be passed to offspring.

6.

A ___________ can determine an exact genotype.

a)

test cross

b)

hybridization process

c)

phenotype

d)

genome

7.

Which statement is true of carriers? Select all that apply (there could be multiple possible correct answers).

a)

They can pass a recessive disorder gene on to offspring.

b)

They express the recessive trait.

c)

They have one dominant allele.

d)

They are heterozygous for a recessive disorder gene.

8.

You and your colleagues are constructing a pedigree for a boy with cystic fibrosis. The individual’s younger brother has also been diagnosed with cystic fibrosis. How would these brothers be represented in a pedigree?

a)

Both would be represented as completely shaded squares.

b)

The older brother would be a shaded square, while the younger brother would be a half-shaded square.

c)

Both would be represented as unshaded squares.

d)

Both would be represented as completely shaded circles.

9.

Traits controlled by genes on the X chromosome are called sex-linked traits. In what individuals are recessive sex-linked traits more commonly expressed?

a)

females because they have two X chromosomes

b)

males because they have only one X chromosome

c)

females because they have no Y chromosome

d)

males because they have a Y chromosome

10.

Human blood groups are determined by ____________. Select all that apply (there could be more than one correct answer).

a)

multiple alleles

b)

codominance

c)

incomplete dominance

d)

single alleles

11.
The following picture represents what pattern of inheritance?
a)
Complete dominance
b)
Incomplete dominance
c)
Co-dominance
d)
Sex-linked inheritance
12.
In the following Punnett Square, R represents red scales and B represents blue scales.  If scale type shows co-dominance in fish, what is the probability of each color in the offspring?
a)
50% blue, 50% red and blue, 0% red
b)
50% purple and 50% blue
c)
100% red and blue
d)
0% red, 0% blue, 100% red and blue
13.

In the blood type Punnett square shown, what is the probability the offspring will inherit each blood type?

a)

50% A, 25% B, 0% AB, 25% O

b)

25% A, 50% B, 25% AB, 0% O

c)

50% A and 50% B

d)

25% AB, 50% A, 25% O

14.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
15.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
16.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
17.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
18.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
19.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
triangle
d)
diamond
20.
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
21.

Which of the following genotypes is homozygous dominant?

a)

aa

b)

Aa

c)

AA

22.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

23.

The different forms of a gene

a)

alleles

b)

atoms

c)

proteins

d)

wheels

24.

This trait is hidden whenever the dominant allele is present

a)

dominant allele

b)

codominance

c)

recessive allele

d)

Punnett Square

25.

This trait always shows up in an organism when the allele is present

a)

dominant allele

b)

codominance

c)

probability

d)

recessive allele

26.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
27.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
28.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
29.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
30.

Phenotype determines genotype

a)

True

b)

False

31.

A homozygous brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).


Perform a punnett square cross and determine the phenotype & %.

a)

100 % tan

b)

100 % brown

c)

50 % brown and 50% tan

d)

75 % brown and 25 % tan

32.

What genotype would go in box 2? And is it Homozygous or Heterozygous?

a)

BB Heterozygous

b)

Bb Heterozygous

c)

bb Homozygous

d)

Bb Homozygous

33.

In plants, tall (T) is dominant to short (t).


Draw a punnett square and perform the following cross: Tt x Tt


What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

34.

What are the possible genotypes for this cross? And what percentage of each is produced?

a)

TT = 25% Tt= 50% tt=25%

b)

all tall

c)

TT= 75% tt = 25%

d)

Tt = 100%

35.

The physical appearance of a trait is known as the-

a)

genotype

b)

phenotype

c)

Homozygous

d)

intelligence

36.

Gretford is heterozygous. If (R) for Round head, and (r) is for Egg head, what is Gretford's genotype?

a)

RR

b)

Rr

c)

rr

d)

rR

37.

Kyree is heterozygous. If (W) is for waves, and (w) if for no waves.


What is Kyree’s genotype & phenotype?

a)

WW : waves

b)

ww : waves

c)

Ww : no waves

d)

Ww : Waves

38.

A heterozygous tall pea plant (T) is crossed with a short pea plant (t).


Perform a punnett square cross and determine the Genotype & %.

a)

100% Tt

b)

50% Tt, 50% tt

c)

75%Tt, 25%tt

d)

25%TT, 50%Tt, 25%tt

39.

What is a GENOTYPE?

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

mitosis

d)

meiosis

40.

Which of the following are GENOTYPES? (select all correct answers)

a)

black hair

b)

homozygous dominant

c)

heterozygous

d)

blue eyes

e)

BB

41.

PHENOTYPE is

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

nucleic acid

d)

Aa

42.

Which of the following are PHENOTYPES?

a)

green skin

b)

Aa

c)

homozygous recessive

d)

purple eyes

e)

black fur

43.

The prefix "homo" means

a)

different

b)

same

c)

tomorrow

d)

never

44.

The prefix "hetero" means

a)

different

b)

ugly

c)

fancy

d)

same

45.

If A = red fur and a = white fur, what are the PHENOTYPIC ratios of the offspring based on the Punnett Square?

a)

25% heterozygous

b)

50% purple

c)

75% red fur and 25% white fur

d)

25% homozygous recessive, 50% heterozygous, 25% homozygous dominant

46.

If A = green pods and a = yellow pods, what are the PHENOTYPIC RATIOS of the offspring in the Punnett square?

a)

100% green pods

b)

100% yellow pods

c)

100% heterozygous

d)

100% homozygous dominant

47.

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

a)

recessive

b)

dominant

c)

both

48.

Two brown eyed parents (Bb) have a baby. What is the chance their baby is blue eyed?

a)

0 %

b)

25%

c)

50%

d)

75%

49.

Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?

a)

25%

b)

1%

c)

10%

d)

0%

50.

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

a)

25%

b)

50%

c)

75%

d)

100%

51.

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

a)

recessive

b)

dominant

c)

both

52.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
53.
Which statement best supports why many offspring look similar to their parents?
a)
Offspring inherit characteristics from one parent.
b)
Offspring inherit characteristics from both parents.
c)
Parents choose which characteristics to pass on to their offspring.
d)
Parents choose to change their appearance to match that of their offspring.
54.

An organism with the genotype DD for a trait is __. Select all that apply.

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

55.
In the following Punnett Square, R represents red scales and B represents blue scales.  If scale type shows co-dominance in fish, what is the probability of each color in the offspring?
a)
50% blue, 50% red and blue, 0% red
b)
50% purple and 50% blue
c)
100% red and blue
d)
0% red, 0% blue, 100% red and blue
56.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
57.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
58.
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
59.

Which of the following genotypes is homozygous dominant?

a)

aa

b)

Aa

c)

AA

60.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

61.

The different forms of a gene

a)

alleles

b)

atoms

c)

proteins

d)

wheels

62.

This trait is hidden whenever the dominant allele is present

a)

dominant allele

b)

codominance

c)

recessive allele

d)

Punnett Square

63.

This trait always shows up in an organism when the allele is present

a)

dominant allele

b)

codominance

c)

probability

d)

recessive allele

64.
Black fur is dominant (B) over white fur (b).  Find the probability of heterozygous offspring using the following genotype of these parents.
Bb + bb
a)
0%
b)
25%
c)
50%
d)
100%
65.
What are genes?
a)
Something you wear.
b)
Segments of DNA that carry traits for offspring.
c)
The powerhouse of cells.
d)
None of the above.
66.
Which of the following is an example of phenotype?
a)
bb
b)
blue eyes
67.
Which of these is homozygous recessive?
a)
Rr
b)
rR
c)
RR
d)
rr
68.
The passing of traits from parent to offspring. 
a)
Heredity
b)
Traits
c)
Genetics
d)
Genes
69.
The study of how traits are inherited through the interactions of genes. 
a)
Genetics
b)
Heredity
c)
Genes
d)
Traits
70.
Physical characteristics that are passed down from parents to offspring during sexual reproduction. 
a)
Phenotype
b)
Traits
c)
Genes
d)
Heredity
71.
Structures found in the nucleus of a cell that contain DNA. 
a)
Genes
b)
Chromosomes
c)
Allele
d)
Traits
72.
The set of genes carried by the organism. 
a)
Genotype
b)
Phenotype
c)
Alleles
d)
Traits
73.
The physical expression of the genes. 
a)
Genotype
b)
Phenotype
c)
Allele
d)
Traits
74.
Characteristics that are passed from parent to offspring.
a)
Heredity
b)
Genetics
c)
Inherited Traits
d)
Alleles
75.
Traits that cover over, or dominate another form of that trait. Always shows up in the phenotype, even when only one is present. 
a)
Inherited Traits
b)
Acquired Traits
c)
Recessive trait
d)
Dominant trait
76.
Traits that are covered over, or dominated, by another form of that trait and seem to disappear. Only shows up in the phenotype if there are two of these alleles present. 
a)
Dominant trait
b)
Recessive trait
c)
Inherited trait
d)
Acquired trait
77.
Both alleles (forms of the gene) are the same. 
a)
Homogeneous
b)
Homozygous
c)
Heterogeneous
d)
Homogeneous
78.
When alleles occur in different forms.
a)
Heterozygous
b)
Homozygous
c)
Heterogeneous
d)
Homogeneous
79.
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%
80.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
81.
What is the yellow seed genotype?
a)
aa
b)
Aa
c)
AA
d)
AA or Aa
82.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
83.

True or False: The dominant trait is represented by a lowercase letter (r).

a)

True

b)

False

84.

True or False: A trait is a characteristic passed from one generation to another.

a)

True

b)

False

85.

Diploid organisms pass on their alleles to their offspring in haploid specialized cells called

a)

gametes

b)

haploids

c)

genes

d)

somatic cells

86.

Which of the following are gametes? (Check all that apply.)

a)

eggs

b)

sperm

c)

somatic cells

d)

body cells

87.

Gametes are produced during the process of

a)

meiosis

b)

mitosis

c)

replication

d)

independent assortment

88.
A single cross such as flower color.
a)
mono hybrid
b)
dihybrid
c)
crossing over
d)
homozygous
89.
What type of "square" helps us solve genetic problems?
a)
carpenter square
b)
Mendel square
c)
Punnett square
d)
genetic square
90.
TT,tt,PP,pp,SS,ss are examples of alleles that are?
a)
homozygous
b)
heterozygous
c)
different
d)
homologous 
91.
The exact genetic makeup of an organism, such as RR, Tt, PP is its?
a)
phenotype
b)
dominance
c)
genotype
d)
trait
92.
Y for yellow body is dominant over y for blue body.  What alleles would produce yellow bodies?
a)
YY,yy
b)
Yy,yy
c)
YY only
d)
YY,Yy
93.
"The Great White Shark was 20 feet in length.  Phenotype or Genotype?
a)
phenotype
b)
genotype
94.
Females-XX; MalesXY.  A couple has 4 girls.  What is the chance the next child will be a boy?
a)
75%
b)
100%
c)
25%
d)
50%
95.
If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?
a)
tall
b)
short
c)
medium
d)
not enough info
96.
A physical characteristic that can be passed from parent to offspring.
a)
behavior
b)
trait
c)
strong muscles
d)
ability to fly a plane.
97.

Who is considered the "father" of modern genetics?

a)

Einstein

b)

Mendel

c)

Disney

d)

Washington

98.

What plant did Mendel study?

a)

pea plant

b)

spinach

c)

carrots

d)

sunflowers

99.

Which of the following alleles is homozygous (purebred) recessive?

a)

TT

b)

Tt

c)

tt

d)

ts

100.

Red (R) is dominant over white (r). How can a flower be white?

a)

It can have RR and be white.

b)

It has to have rr.

c)

It has to have rR

d)

There is no way it can be white until the third generation.

101.

Which of the following is an inheritable genetic trait?

a)

language

b)

type of music you like

c)

eye color

d)

slow growth due to insufficient nutrition.

102.

Alternant or different genes that code for the same trait are called?

a)

chromosomes

b)

segments

c)

alleles.

d)

homozygous.

103.
This is an example of a ______________.
a)
phenotype
b)
genotype
c)
xenotype
d)
base pairs
104.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
105.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
106.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
107.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
108.
A ________________________ is a tool used to predict the possible genotype from certain parents
a)
Mendel Grid
b)
Genetic Tic Tac Toe
c)
Punnett Square
d)
Pedigree Plot
109.
What term describes what you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
110.
Two heterozygous parents produce offspring. What is the probability of the HETEROZYGOUS GENOTYPE appearing in the offspring generation?
a)
75%
b)
25%
c)
50%
d)
100%
111.
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%
112.
In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?
a)
GG
b)
Gg
c)
gg
d)
green
113.
A dihybrid cross involves only one trait.
a)
True
b)
False
114.

In a heterozygous genotype, the ___________ allele will be expressed in the phenotype.

a)

recessive

b)

dominant

c)

lower case letter

d)

both

115.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
116.
HH crossed with Hh. What is the probability of hh?
a)
0%
b)
25%
c)
50%
d)
100%
117.
What is another way of saying "hybrid"?
a)
heterozygous
b)
homozygous dominant
c)
homozygous recessive
d)
none of these choices
118.
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%
119.
The genotypic percentage resulting from this this cross would be _____________________.
a)
25% blue eye 75 % brown eye 
b)
BB = 25% Bb = 50% bb = 25%
c)
BB= 50 % bb = 50%
d)
All brown eye
120.

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

a)

BBEE x bbee

b)

BBEe x BbEe

c)

BbEE x BbEe

d)

BBee x BBEE

121.

Which of the following genotypes are homozygous dominant?

a)

A

b)

Aa

c)

AA

d)

aa

122.

Which of the following genotypes are heterozygous?

a)

Bb

b)

BB

c)

bb

d)

B

123.

YOU MUST SHOW YOUR WORK ON NOTEBOOK PAPER FOR THIS QUESTION AND TURN IT IN!

Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails?

a)

0%

b)

25%

c)

50%

d)

100%

124.

YOU MUST SHOW YOUR WORK ON NOTEBOOK PAPER FOR THIS QUESTION AND TURN IT IN!

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?

a)

0%

b)

25%

c)

50%

d)

75%

125.

YOU MUST SHOW YOUR WORK ON NOTEBOOK PAPER FOR THIS QUESTION AND TURN IT IN!

Cross Two Homozygous plants (RRYY x rryy)

R = round seeds, r = wrinkled seeds

Y = yellow seeds, y = green seeds

What percent will have Round and Yellow seeds?

a)

0%

b)

25%

c)

50%

d)

100%

126.

YOU MUST SHOW YOUR WORK ON NOTEBOOK PAPER FOR THIS QUESTION AND TURN IT IN!

What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits (ex. AaBb) ?

a)

1/16

b)

1/4

c)

1/2

d)

3/16

127.

E = brown eyes

e = blue eyes

What is true about these two brothers?


One has genotype Ee the other ee.

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

128.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
129.
Which is the correct phenotype for this organism?
a)
BB
b)
blue
c)
green
d)
bb
130.
Incomplete dominance means that the traits are
a)
expressed equally
b)
dominant
c)
recessive
d)
blended
131.
If you cross a black guinea pig with a white guinea pig and the offspring are gray, what type of dominant trait would that be.
a)
incomplete dominance
b)
codominance
c)
codependant
d)
cooperative
132.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
133.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
134.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
135.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
136.
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%
137.
Why are there no white rabbit babies?
a)
The white gene is not present in any of the babies.
b)
It takes two recessive genes to show the trait.
c)
Grey is a better color.
d)
Baby five will be white.
138.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
139.
In rabbits, black fur (B) is dominant over brown fur (b). If a rabbit has brown fur, what can you conclude about its genotype?
a)
It is BB.
b)
It is Bb
c)
It is brown
d)
It is bb.
140.
 One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
a)
100%
b)
75%
c)
50%
d)
25%
141.
What are the possible genotypes for this cross?
(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%
142.
This is an example of
a)
Complete dominance
b)
Mendelian Genetics
c)
Codominance
d)
Incomplete Dominance
143.
This punnett square shows a cross between
a)
A hybrid Parent and a Homozygous parent
b)
A heterozygous parent and a heterozygous parent
c)
Two homozygous parents
d)
Two Hybrid Parents
144.

Which of the following genotypes is homozygous dominant?

a)

Yy

b)

yY

c)

yy

d)

YY

145.

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

146.

B=Brown fur

b=tan fur

What percent of the offspring would be tan when you cross BbxBb?

a)

75%

b)

25%

c)

50%

d)

100%

147.

What is the genotypic ratio of the offspring?

a)

3:1

b)

1:3

c)

1:2:1

d)

2:2

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