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Test cross using Punnette Square

Total questions: 100

Worksheet time: 4hrs 57mins

Name
Class
Date
1.

In African-violet plants, purple flowers are dominant to white flowers. You purchase an African-violet plant with white flowers. It's genotype could be represented as :

a)

PP

b)

Pp

c)

pP

d)

pp

2.

To discover whether an animal showing the dominant trait is homozygous or heterozygous, it must be crossed with an animal that is:

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous

d)

choices B & C

3.

Two tall pea plants are crossed, producing 105 tall plants & 32 short plants. The genotypes of the tall parent plants are:

a)

Tt & Tt

b)

TT & Tt

c)

Tt & tt

d)

tt & tt

4.

A spotted dalmation is mated with a pure-white dalmation (ss) to deteremine whether its genotype is SS or Ss for spots. Three puppies are born, all with spots. We can conclude that the spotted dalmation is SS.

a)

TRUE

b)

FALSE

5.

In mice brown (B) is dominant to white (b). A brown mouse is mated with a white mouse. Twelve brown mice are produced. The brown mouse's genotype is:

a)

BB

b)

Bb

c)

bb

d)

a reliable conclusion can't be reached

6.

Two brown-eyed parents have a child with blue eyes. The best explanation is:

a)

a mutation occured before the child was born

b)

both parents carry the allele for blue eyes

c)

both parents are pure for brown eyes

7.

Which scenario best supports the conclusion that a black guinea pig's genotype is homozygous dominant?

a)

after mating with a white guinea pig, 2 black & 2 white guinea pigs were produced

b)

after mating with a white guinea pig, 10 black & 8 white guinea pigs were produced

c)

after mating with a white guinea pig, 12 black guinea pigs were produced

d)

after mating with a black guinea pig, 4 black guinea pigs were produced

8.

Individuals with the same phenotype have the same genotype

a)

TRUE

b)

FALSE

9.

In a test cross to determine whether a fruit fly is homozygous (WW) or heterozygous (Ww) for long wings, 7 long-winged flies & 1 short winged-fly are produced. Which is a valid conclusion?

a)

the unknown fruit fly is WW

b)

the unknown fruit fly is Ww

c)

the unknown fruit fly is ww

d)

more offspring are needed

10.

In hamsters, long tails (L) are dominant to short tails (l). A student wishes to perform a test cross to determine whether a female long-tailed hamster is homozygous or heterozygous for tail length. She mates the hamster with a male long-tailed hamster & studies the offspring, which are 100% long-tailed. She concludes that the female hamster's genotype is "LL". What mistake(s) did the student make?

a)

she should have mated the female hamster with a male that was known to be hybrid

b)

she should have mated the female hamster with a short-tailed male hamster

c)

she should have mated the female hamster with another long-tailed female

d)

she has to mate members of the litter before she can make a conclusion

11.
Dominant or recessive?
tt
a)
Dominant 
b)
Recessive
12.
Dominant or recessive?
Dd
a)
Dominant
b)
recessive
c)
neither
d)
homozygous
13.
Emily has brown hair. Which is most likely a true statement about Emily?
a)
Emily’s favorite color is brown.
b)
Emily has a parent with brown hair.
c)
Emily’s older brother has brown hair. 
14.
What should students use to identify the percent chance of a trait being passed down from a parent to its offspring?
a)
a graph
b)
a flow chart
c)
a data table
d)
a Punnett square
15.
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.
16.
Bob is a tall, slender young man with red hair and blue eyes. Which couple would most likely be Bob’s parents?
a)
a slender, red-haired father and a tall, blue-eyed mother
b)
a tall green-eyed father with long brown hair and a short, brown-haired mother
c)
a short, green-eyed, black-haired father and a tall, brown haired, brown-eyed mother
d)
a short, plump brown-haired father with freckles and a short, blue-eyed red-haired mother
17.
What are the possible combinations of a pea plant with the alleles PP and a male pea plant with the alleles pp.
P= purple
p= white
a)
all Pp
b)
all PP
c)
Pp,PP,Pp,PP
d)
all pp
18.
When the allele combination is a dominate and a recessive trait together which trait will be seen?
a)
Dominate
b)
Recessive
c)
none
d)
both
19.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
20.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
21.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
22.
What is a phenotype?
a)
The expression of a trait; physical appearance.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
23.
This means Different Gene
a)
Dominant
b)
Recessive
c)
Homozygous
d)
Heterozygous
24.
Homozygous or heterozygous?
BB
a)
Homozygous
b)
Heterozygous
25.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
26.

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

a)

black hair

b)

homozygous dominant

c)

heterozygous

d)

blue eyes

e)

BB

27.

PHENOTYPE is

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

nucleic acid

d)

Aa

28.

Which of the following are PHENOTYPES?

a)

green skin

b)

Aa

c)

homozygous recessive

d)

purple eyes

e)

black fur

29.

Which of the following represents alleles for the homozygous dominant genotype?

a)

Aa

b)

aa

c)

AA

30.

Which of the following represents alleles for the homozygous recessive genotype?

a)

Aa

b)

aa

c)

AA

31.

Which of the following represents alleles for the heterozygous genotype?

a)

Aa

b)

aa

c)

AA

32.

If A = red fur and a = white fur, what color fur would Aa be? (COMPLETE DOMINANCE)

a)

red

b)

white

c)

purple

d)

blue

33.

If A = red fur and a = white fur, what color fur would AA be? (COMPLETE DOMINANCE)

a)

red

b)

white

c)

purple

d)

blue

34.

What is a GENOTYPE?

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

mitosis

d)

meiosis

35.
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
36.
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
37.
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
38.

In cattle red coats are represented as RR, and white coats are represented as WW.


What is the genotype for Roan color?

a)

RR

b)

RW

c)

WW

39.

What are the possible genotypes for this cross? And what percentage of each is produced? (if this isn't familiar, re-watch this week's videos!)

a)

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

b)

all tall

c)

TT= 75% tt = 25%

d)

Tt = 100%

40.

A heterozygous tall pea plant (Tt) is crossed with a short pea plant (tt).


Perform a punnett square cross and determine the Genotype & %. (if this isn't familiar, re-watch this week's videos!)

a)

100% Tt

b)

50% Tt, 50% tt

c)

75%Tt, 25%tt

d)

25%TT, 50%Tt, 25%tt

41.

If an organism is said to have a genotype of "aa", which of the following then best describes it?

a)

Homozygous recessive

b)

Homozygous dominant

c)

Heterozygous dominant

d)

Heterozygous recessive

42.

If round seeds (R) are dominant to wrinkled seeds, which best describes a seed that's heterozygous?

a)

rr

b)

RR

c)

Rr

d)

Wrinkled

43.

Yellow flowers (Y) are dominant to white flowers. Which best describes a white flower?

a)

YY

b)

Homozygous dominant

c)

Heterozygous recessive

d)

yy

44.

Yellow flowers (Y) are dominant to white flowers. Which best describes a genotype of "Yy"?

a)

yellow

b)

Homozygous dominant

c)

Heterozygous recessive

d)

yy

45.

Based on the Punnett Square shown, what should fill in the missing box?

a)

GG

b)

Gg

c)

gg

d)

gG

46.

Based on the Punnett Square shown, what percent of the offspring will probably be a green pea?

a)

25%

b)

50%

c)

75%

d)

100%

47.

Based on the Punnett Square shown, what should go in the missing boxes?

a)

BB

b)

Bb

c)

bb

d)

white flower

48.

Based on the Punnett Square shown, what is the probability that the child will have blue eyes?

a)

0%

b)

25%

c)

505

d)

75%

e)

100%

49.

Based on the Punnett Square shown, what should go in the missing boxes?

a)

tt

b)

Tt

c)

tT

d)

TT

50.

Based on the Punnett Square shown, what best describes the alleles of missing boxes?

a)

tt

b)

Tt

c)

Homozygous dominant

d)

Heterozygous

51.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
52.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
53.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
54.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
55.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
56.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
57.
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%
58.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
59.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
60.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
61.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
62.
AA and Aa always show up as
a)
dominant
b)
recessive
63.
aa always shows up as
a)
dominant
b)
recessive
64.
Aa is
a)
homozygous
b)
heterozygous
65.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
66.
What is a punnett square?
a)
graph used to predict the possible genotypes of offspring in a given cross
b)
a graph used to predict the possible birth rate of offspring.
c)
a graph used to predict the possible behavioral characteristics an offspring could have
d)
None of the above
67.
In a punnet 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
68.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
69.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
70.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
71.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
72.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
73.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
74.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
75.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
76.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
77.
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%
78.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
79.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
80.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
81.
AA and Aa always show up as
a)
dominant
b)
recessive
82.
aa always shows up as
a)
dominant
b)
recessive
83.
Aa is
a)
homozygous
b)
heterozygous
84.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
85.
What is a punnett square?
a)
graph used to predict the possible genotypes of offspring in a given cross
b)
a graph used to predict the possible birth rate of offspring.
c)
a graph used to predict the possible behavioral characteristics an offspring could have
d)
None of the above
86.
In a punnet 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
87.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
88.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
89.
In the Punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
90.
B = brown fur  b = white fur
In the Punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
91.
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%
92.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
93.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
94.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
95.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

96.

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

a)

Codominance

b)

Incomplete dominance

97.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

a)

Incomplete dominance

b)

Codominance

98.

If you cross a black chicken with a white chicken, only black and white checkered chickens would be produced. What kind of inheritance pattern does this follow?

a)

Incomplete dominance

b)

Codominance

99.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

100.

What does this Punnett square and the probabilities of the ofspring represent?

a)

incomplete dominance

b)

codominance

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