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Genetics Exam

Total questions: 70

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

Where are "Genes" found?

a)

Mitochondria

b)

Cytoplasm

c)

Centrosomes

d)

Chromosomes

2.

How many chromosomes do humans have?

a)

23

b)

92

c)

46

d)

184

3.

How do we write DOMINANT alleles?

a)

Capital letters

b)

Lower case

4.

How do we write recessive alleles?

a)

Capital letters

b)

Lower case

5.
The man who studied genetics and came up with genetics is
a)
Watson
b)
Crick
c)
Mendel
d)
Darwin
6.
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
7.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
8.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
9.
What is a phenotype
a)
The genetic make up (code)
b)
The physical trait
10.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
11.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
12.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
13.
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
14.
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
15.

Who is considered the "father" of modern genetics?

a)

Einstein

b)

Mendel

c)

Disney

d)

Washington

16.
A single cross such as flower color.
a)
mono hybrid
b)
dihybrid
c)
crossing over
d)
homozygous
17.
What type of "square" helps us solve genetic problems?
a)
carpenter square
b)
Mendel square
c)
Punnett square
d)
genetic square
18.
TT,tt,PP,pp,SS,ss are examples of alleles that are?
a)
homozygous
b)
heterozygous
c)
different
d)
homologous 
19.
The exact genetic makeup of an organism, such as RR, Tt, PP is its?
a)
phenotype
b)
dominance
c)
genotype
d)
trait
20.
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
21.
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%
22.

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

a)

TT

b)

Tt

c)

tt

d)

ts

23.

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.

24.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
25.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
26.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
27.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
28.
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%
29.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
30.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
31.

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

a)

Incomplete Dominance

b)

Codominance

32.

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

a)

Incomplete Dominance

b)

Codominance

33.

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

34.

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


Cross two speckled flowers.

a)

1 red, 2 speckled, 1 blue

b)

2 red, 2 blue

c)

2 blue, 2 speckled

d)

1 red, 1 speckled, 2 blue

35.

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


Cross a red flower with a blue flower.

a)

1 red, 2 speckled, 1 blue

b)

2 red, 2 blue

c)

4 speckled

d)

1 red, 1 speckled, 2 blue

36.

In mice coat color is incompletely dominant. Black and white are homozygous. Brown mice are heterozygous.


What is the genotype for a brown mouse?

a)

BB

b)

Bb

c)

bb

37.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

38.

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

39.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

40.

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

41.

A woman with curly hair and a man with straight hair produced a child with wavy hair:

a)

Incomplete dominance

b)

Codominance

c)

Complete dominance

42.

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have red (RR) flowers?

a)

0%

b)

25%

c)

50%

d)

100%

43.

A long-haired female rabbit and a short-haired male rabbit produced this offspring with a medium-length coat:

a)

Incomplete dominance

b)

Codominance

c)

Complete dominance

44.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

d)

female with white eyes

45.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R Y ?

a)

male with white eyes

b)

female with white eyes

c)

male with red eyes

d)

female with red eyes

46.
What percentage of the offspring will have this recessive disease?
a)
0%
b)
25%
c)
50%
d)
75%
47.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
d)
25%
48.
I have 2 X chromosomes. What am I?
a)
Male
b)
Female
49.
I have 1 X chromosome and 1 Y chromosome. What am I?
a)
Male
b)
Female
50.

Males are more likely to suffer from a sex-linked disease or disorder because

a)

males have 2 X chromosomes, so they are twice as likely to receive the disease

b)

males have less DNA

c)

males have 1 X chromosome, so the disorder is more likely to be expressed

51.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
52.

X-Linked traits are more common in

a)

males

b)

females

53.

a photograph or picture of chromosomes grouped in ordered pairs is a ______________

a)

pedigree

b)

Punnett Square

c)

Venn Diagram

d)

Karyotype

54.

A normal human zygote should have _____ chromosomes inside.

a)

46

b)

23

c)

92

d)

64

55.
What is the gender of the individual whose karyotype is seen in the image?
a)
Male
b)
Female
56.
Which structure is labeled as A in the diagram?
a)
Centromere
b)
Chromosome
c)
Sister chromatids
57.
A pair of identical chromosomes shown in a karyotype, one inherited from mom, and one inherited from dad are called
a)
sister chromotids
b)
centromeres
c)
homologous chromosomes
d)
autosomes
58.

karyotypes are constructed by matching ________________chromosomes.

a)

synonymous

b)

homologous

c)

asynchronous

d)

notbettathanous

59.

Karyotypes are used in genetic counseling. check the correct answer.

a)

true.

b)

false.

60.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
61.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
62.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
63.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
8
b)
5
c)
2
d)
3
64.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
65.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
66.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
67.
How many females are in this pedigree?
a)
3
b)
4
c)
6
d)
7
68.
What is this?
a)
Pedigree
b)
Karyotype
c)
Venn diagram
d)
Punnett Square
69.

Huntington's Disease is a dominant trait.

What is the correct genotype for individual I-2?

a)

HH

b)

Hh

c)

hh

d)

H?

70.

If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?

a)

HH

b)

Hh

c)

hh

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