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Genetics & Heredity Practice Test

Total questions: 79

Worksheet time: 7hrs 35mins

Name
Class
Date
1.

Which of the following genotypes is dominant?

a)

AA

b)

Aa

c)

aa

d)

both AA and Aa

2.

How would you write a homozygous dominant genotype?

a)

AA

b)

Aa

c)

aa

d)

either AA or Aa

3.

Which of the following best describes the genotype "Rr"?

a)

recessive

b)

heterozygous

c)

purebred

d)

all of the above

4.

Which of the following genotypes are homozygous?

a)

Aa

b)

BB

c)

dd

d)

BB and dd

5.

If tall plants are dominant and short plants are recessive, how would you write the genotype for a homozygous tall plant?

a)

BB

b)

Bb

c)

bb

6.

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

a)

FF

b)

Ff

c)

ff

7.

If brown eyes are dominant and blue eyes are recessive, what color eyes do the parents in this Punnett Square have?

a)

one has brown eyes and the other has blue eyes

b)

they both have blue eyes

c)

they both have brown eyes

d)

there's no way to tell based on this information

8.

Which of these Punnett squares represents a cross between a homozygous dominant parent and a heterozygous parent?

a)
b)
c)
d)
9.

Based on this Punnett square, what is the chance that an offspring will have a homozygous genotype?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

10.
Which of the following is heterozygous
a)
FF
b)
tt
c)
Gg
d)
RR
11.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
12.
What does the prefix hetero- in heterozygous mean?
a)
same
b)
different
c)
dating
d)
human
13.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
14.

Every organism has a genotype and a phenotype.

a)

True

b)

False

c)

True today, false tomorrow

d)

IDK

15.
Alternative forms of a gene are called
a)
Alleles
b)
Homozygous
c)
DNA
d)
Genetics
16.
The physical appearance of an organism based on traits
a)
Genotype
b)
Phenotype
c)
Meiosis
d)
Genetics
17.
The allele combinations
a)
genetics
b)
mitosis
c)
genotype
d)
phenotype
18.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
19.
different forms of the same gene are called
a)
alleles
b)
genetics
c)
p generation
d)
law of segregation
20.
What is a recessive allele?
a)
A trait that is always shown (capital letter)
b)
A trait that can be hidden (lower case letter)
c)
Alleles that are the same
d)
Alleles that are different
21.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?
a)
BB
b)
bb
c)
Bb
d)
bB
22.
The different forms of a gene are called 
a)
traits
b)
chromosomes
c)
alleles
d)
peas
23.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's phenotype?
a)
Brown Hair
b)
Blonde Hair
c)
Brown and Blonde Hair
d)
Black Hair
24.
How many letters does a genotype contain?
a)
1
b)
2
c)
3
d)
4
25.
Hair colour is an example of
a)
genotype
b)
phenotype
26.
Having the genes for baldness is an example of
a)
genotype
b)
phenotype
27.
How tall you are is an example of
a)
genotype
b)
phenotype
28.

When one allele is not dominant over another, resulting in a blended phenotype for heterozygous offspring is considered....

a)

Incomplete Dominance

b)

Codominance

29.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).


Cross a red flower with a speckled flower. What is the phenotypic ratio?

a)

2 red, 2 speckled

b)

2 red, 2 blue

c)

2 blue, 2 speckled

30.

When one allele is not dominant over the other, resulting in both traits expressed in a heterozygous individual.....

a)

Incomplete Dominance

b)

Codominance

31.

Which of the following refers to a complete dominant cross?

a)

One allele completely dominates over the other.

b)

The two alleles are equally seen in the heterozygous genotype.

c)

The two alleles are blended in the heterozygous genotype.

d)

Neither allele is seen in the phenotypes.

32.
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.
33.

If a homozygous recessive woman marries a heterozygous man. What is the chance of having a baby with dimples?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

34.

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%

35.

A blonde woman marries a heterozygous man. What are the chances of a blonde hair baby?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

36.

A woman with curly hair marries a man who is homozygous dominant. What are the chances of a curly hair baby?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

37.

Which of the following genotypes is dominant?

a)

AA

b)

Aa

c)

aa

d)

both AA and Aa

38.

How would you write a homozygous dominant genotype?

a)

AA

b)

Aa

c)

aa

d)

either AA or Aa

39.

Which of the following best describes the genotype "Rr"?

a)

recessive

b)

heterozygous

c)

purebred

d)

all of the above

40.

Which of the following genotypes are homozygous?

a)

Aa

b)

BB

c)

dd

d)

BB and dd

41.

If tall plants are dominant and short plants are recessive, how would you write the genotype for a homozygous tall plant?

a)

BB

b)

Bb

c)

bb

42.

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

a)

FF

b)

Ff

c)

ff

43.

If brown eyes are dominant and blue eyes are recessive, what color eyes do the parents in this Punnett Square have?

a)

one has brown eyes and the other has blue eyes

b)

they both have blue eyes

c)

they both have brown eyes

d)

there's no way to tell based on this information

44.

Which of these Punnett squares represents a cross between a homozygous dominant parent and a heterozygous parent?

a)
b)
c)
d)
45.

Based on this Punnett square, what is the chance that an offspring will have a homozygous genotype?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

46.
Which of the following is heterozygous
a)
FF
b)
tt
c)
Gg
d)
RR
47.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
48.
What does the prefix hetero- in heterozygous mean?
a)
same
b)
different
c)
dating
d)
human
49.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
50.

Every organism has a genotype and a phenotype.

a)

True

b)

False

c)

True today, false tomorrow

d)

IDK

51.

Genotype and phenotype mean the same thing.

a)

True

b)

False

c)

Who knows?

d)

Who cares?

52.
Alternative forms of a gene are called
a)
Alleles
b)
Homozygous
c)
DNA
d)
Genetics
53.
The physical appearance of an organism based on traits
a)
Genotype
b)
Phenotype
c)
Meiosis
d)
Genetics
54.
The allele combinations
a)
genetics
b)
mitosis
c)
genotype
d)
phenotype
55.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
56.
different forms of the same gene are called
a)
alleles
b)
genetics
c)
p generation
d)
law of segregation
57.
What is a recessive allele?
a)
A trait that is always shown (capital letter)
b)
A trait that can be hidden (lower case letter)
c)
Alleles that are the same
d)
Alleles that are different
58.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?
a)
BB
b)
bb
c)
Bb
d)
bB
59.
The different forms of a gene are called 
a)
traits
b)
chromosomes
c)
alleles
d)
peas
60.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's phenotype?
a)
Brown Hair
b)
Blonde Hair
c)
Brown and Blonde Hair
d)
Black Hair
61.
How many letters does a genotype contain?
a)
1
b)
2
c)
3
d)
4
62.
Hair colour is an example of
a)
genotype
b)
phenotype
63.
Having the genes for baldness is an example of
a)
genotype
b)
phenotype
64.
How tall you are is an example of
a)
genotype
b)
phenotype
65.
Dominant or recessive?
tt
a)
Dominant 
b)
Recessive
66.
Dominant or recessive?
Dd
a)
Dominant
b)
recessive
c)
neither
d)
homozygous
67.
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. 
68.
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
69.
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.
70.
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
71.
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
72.
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
73.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
74.
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%
75.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
76.
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
77.
This means Different Gene
a)
Dominant
b)
Recessive
c)
Homozygous
d)
Heterozygous
78.
Homozygous or heterozygous?
BB
a)
Homozygous
b)
Heterozygous
79.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA

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