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Genetics 2024

Total questions: 99

Worksheet time: 1hrs 21mins

Name
Class
Date
1.

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)  

Choose from the below words
0%
25%
50%
75%
2.

Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have? (a)  

Choose from the below words
Red
Blue
Purple
50% Red, 50% Blue
3.
What phenotype would result from crossing a homozygous dominant purple-flowered pea plant with a homozygous recessive white-flowered pea plant?
a)
Pp
b)
Purple
c)
White
d)
PP and pp
4.

Two parents have a heterozygous genotype for eye color. What is the chance of having a blue eye baby?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

5.

A heterozygous woman marries a homozygous recessive man. What are the chances of a freckled baby?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

6.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
7.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
8.
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 
9.
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%
10.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 
a)
100 % tan
b)
100 % brown 
c)
50 % brown and 50% tan 
d)
75 % brown and 25 % tan 
11.

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%

12.
A Jawa notices that his beloved pet desert rat, who has brown fur, just had several rat babies, some of which had white fur and some which had brown fur. Brown fur is the dominant trait. This means his rat must have what genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
13.

Genotype or Phenotype: Black hair

a)

Phenotype

b)

Genotype

14.

Genotype or Phenotype: ff

a)

Genotype

b)

Phenotype

15.

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

16.
Gregor Mendel is often called ....
a)
The father of heredity.
b)
The father of genetics.
c)
The king of peas
d)
The father of punnett squares.
17.

Why did Gregor Mendel use the plants he did in his experiments? (Choose all that apply)

a)

They can self pollinate

b)

They grow really slowly

c)

They are blue, green, and red.

d)

They grow really quickly

18.
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

19.
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

20.
Heterozygous is when...
a)

the alleles are the same

b)

the alleles are different

c)

the alleles are absent

d)

the alleles are present

21.
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
22.
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
23.
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
24.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
25.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
26.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
27.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
28.
Magda is a tall, 11 year old drummer. She has a scar on her right cheek. She is good at swimming. Which of her traits did Magda most likely inherit?
a)
height
b)
the scar
c)
ability to swim
d)
ability to play drums
29.
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%
30.
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
31.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
32.
Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75%tall and 25% short
c)
100%short
33.
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?
a)
none
b)
3/4
c)
1/2
d)
all
34.

Punnett Square #1

In plants tall is dominant to short.

Cross two heterozygous plants.

What is the genotypic ratio?

a)

1:2:1

b)

2:2

c)

3:1

35.

Punnett Square #1

In plants tall is dominant to short.

Cross two heterozygous plants.

What is the phenotypic ratio?

a)

1:2:1

b)

2:2

c)

3:1

36.

Which of the choices is heterozygous?

a)

BB

b)

Bb

c)

bb

37.

Which of the choices is homozygous recessive?

a)

BB

b)

Bb

c)

bb

38.

Which of the choices is homozygous dominant?

a)

BB

b)

Bb

c)

bb

39.

Which of the choices are dominant? (there may be more than one)

a)

BB

b)

Bb

c)

bb

40.

Which of the choices is recessive?

a)

BB

b)

Bb

c)

bb

41.

The ratio of homozygous dominant to heterozygous

to homozygous recessive offspring

a)

Genotypic Ratio

b)

Phenotypic Ratio

c)

Monohybrid Cross

d)

Homologous Pair

42.

In a Punnett square, a lower case letter stands for a ____________ allele.

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

43.

Hair color, height, eye color and freckles are examples of human traits. What do we call the physical expression of the genetic material of an organism?

a)

genetics

b)

heredity

c)

genotype

d)

phenotype

44.

In animals, shaggy fur is dominant to short fur. The Punnett Square shows the genotypes of the offspring of a shaggy fur animal and a short fur animal. What were the genotypes of the parents?

a)

FF and FF

b)

Ff and ff

c)

ff and ff

d)

Ff and Ff

45.

In animals, shaggy fur is dominant to short fur. According to the genotypes shown, what percent of offspring will have short fur?

a)

0

b)

25

c)

50

d)

75

e)

100

46.
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
47.

Heterozygous is when...

a)

the alleles are the same.

b)

the alleles are different.

c)

the alleles are absent.

d)

the alleles are present.

48.

T = tall and t = short

In the punnett square shown, what belongs in the missing square

a)

tt

b)

Tt

c)

Bb

d)

TT

49.

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

a)

recessive

b)

dominant

50.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
51.
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
52.

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%

53.

The genotypes AA and Aa always show up as the __________ phenotype.

a)

dominant

b)

recessive

54.
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
55.

Which of the following genotypes is homozygous dominant?

a)

A

b)

Aa

c)

AA

d)

aa

56.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

d)

B

57.

A recessive allele is represented by a ______ letter.

a)

lower-case

b)

capital

58.

A dominant allele is represented by a ______ letter.

a)

lower-case

b)

capital

59.

Blue-eyed is a ______.

a)

genotype

b)

phenotype

60.

Bb is a ______.

a)

genotype

b)

phenotype

61.

If a black guinea pig (BB) and a white guinea pig (bb) mate, there is a ______ chance that a white guinea pig will be born.

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

62.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
63.
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
64.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
65.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
66.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
67.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
68.
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
69.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
70.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
71.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
72.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
73.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
74.
In this punnett square, which is the dominant trait?
The B stands for bud.
a)
purple flower bud
b)
white flower bud
c)
dominant
d)
recessive
75.
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?
a)
none
b)
3/4
c)
1/2
d)
all
76.
The study of heredity and the variation of inherited characteristics 
a)
gene
b)
genetics 
c)
meiosis 
d)
hybrid 
77.
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%
78.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
79.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
80.

Two identical alleles for a trait is known as

a)

homozygous

b)

heterozygous

c)

mutation

d)

codominance

81.

A physical appearance is

a)

genotype

b)

heterozygous

c)

phenotype

d)

codominance

82.

A mutation is harmful to an organism if it

a)

changes the phenotype of an organism

b)

changes the DNA segment

c)

reduces the organism's chance of survival

d)

makes the organism better able to avoid predators

83.

What does Pp mean?

a)

two dominant alleles

b)

heterozygous alleles

c)

one dominant allele

d)

two dominant and recessive alleles

84.

Who studied different characteristics of pea plants by cross-pollinating plants?

a)

Gregor Mendel

b)

Albert Punnett

c)

Sir Isaac Newton

d)

David Kuster

85.

What is the probability of producing a tall pea plant from a cross between two hybrid tall pea plants?

a)

25%

b)

50%

c)

75%

d)

100%

86.

A purebred horse with white hair is crossed with a purebred horse with brown hair. Each of their offspring has both white and brown hair. Why does this occur?

a)

several alleles work together to determine a trait

b)

two alleles for hair are dominant

c)

two alleles for hair are recessive

d)

the alleles for fur color are neither dominant or recessive

87.

What does a Punnett Square determine?

a)

all of Mendel's discoveries about genetic crosses

b)

all the outcomes of a genetic cross

c)

only the recessive allele combinations

d)

only the dominant allele combinations

88.

Genotype is

a)

stem height

b)

feather color

c)

physical appearance

d)

genetic makeup

89.

The term that relates to physical characteristics that are studied in genetics.

a)

traits

b)

offspring

c)

generations

d)

hybrids

90.

Factors that control traits are

a)

purebreds

b)

genes

c)

recessives

d)

parents

91.

Scientists call an organism with two different alleles for a trait

a)

factor

b)

purebred

c)

trait

d)

hybrid

92.

A mutation is

a)

any change that is harmful

b)

any change in a gene or chromosome

c)

any change that is helpful

d)

any change in the phenotype

93.

Which term refers to physical characteristics that are studied in genetics

a)

traits

b)

offspring

c)

generations

d)

hybrids

94.

An organisms's allele combination is known as

a)

phenotype

b)

mutation

c)

hybrid

d)

genotype

95.

If a homozygous black cat (BB) is crossed with a homozygous white cat (bb), what is the probability of having a cat with white fur?

a)

100%

b)

0%

c)

75%

d)

25%

96.

What does RR mean

a)

two dominant alleles

b)

heterozygous alleles

c)

at least one dominant allele

d)

one dominant and one recessive allele

97.

A mutation that is missing a nitrogen base is

a)

deletion

b)

substitution

c)

addition

d)

mixing

98.

What is the primary generation for a Punnett Square called?

a)

F2 generation

b)

F1 generation

c)

P generation

d)

G generation

99.

A mother gives birth to a son, she then gives birth to a daughter. What is the likely hood that she will have another son?

a)

75%

b)

25%

c)

50%

d)

100%

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