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Genetics

Total questions: 81

Worksheet time: 1hrs 12mins

Name
Class
Date
1.
Which of the following terms refers to the different possibilities of a gene?
a)
chromosome
b)
DNA
c)
Punnett Squares
d)
allele
2.
If something is heterozygous, it is also...
a)
purebred
b)
hybrid
c)
dominant
d)
recessive
3.
What does a Punnett Square help you do?
a)
Determine the ratio of phenotypes
b)
Determine the ratio of genotypes
c)
Predict possible traits the offspring will have
d)
All of the above
4.
A phenotype is the...
a)
letter combination
b)
dominant gene
c)
recessive gene
d)
physical appearance
5.
Another word for homozygous is...
a)
purebred
b)
hybrid
c)
heterozygous
d)
dominant
6.
 Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
7.
 Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
8.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
9.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
10.
A woman with blood genotype I(A)i marries a man with blood genotype I(B)i. What is the probability that they would have a child with type O blood?
a)
1/1
b)
1/2
c)
1/3
d)
1/4
11.
A woman with blood genotype I(A)i marries a man with blood genotype I(B)i. What is the probability that they would have a child with type O blood?
a)
1/1
b)
1/2
c)
1/3
d)
1/4
12.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
13.
What is the cause of some traits "skipping" a generation?
a)
dominant traits
b)
recessive traits
c)
hybrid alleles
d)
homologous chromosomes
14.
Recessive alleles are represented by:
a)
a ratio
b)
a percentage
c)
capital letters
d)
lower-case letters
15.
Mendel's law of segregation states that during meiosis, the alleles that control each trait separate, and only _________________ from each pair is/are passed to the offspring
a)
one allele
b)
the dominant trait
c)
two alleles
d)
the recessive trait
16.
What do you call the non-Mendelian inheritance pattern that states that neither trait is dominant and the traits appear to blend together?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
d)
Sex-linked traits
17.
There are many variations in skin color that can be inherited based on the combination of alleles that you inherit from your mom and dad.  This bell curve distribution is an example of
a)
incomplete dominance
b)
codominance
c)
blocked traits
d)
polygenic inheritance
18.
Which of the following is NOT a trait you can inherit?
a)
your athletic ability
b)
your eye color
c)
your hairstyle
d)
your height
19.
Meiosis produces cells with how many chromosomes
a)
44
b)
22
c)
46
d)
23
20.
In which inheritance pattern are heterozygous individuals a blend of the dominant and recessive phenotypes?
a)
sex-linked inheritance
b)
complete dominance
c)
codominance
d)
incomplete dominance
21.
organisms only donate one copy of a gene to their gametes
a)
law of segregation
b)
law of independent assortment
c)
crossing over
d)
meiosis
22.
A genotype in which the two alleles are the same
a)
divergent
b)
heterozygous
c)
homozygous
d)
convergent
23.
A set of alleles that an individual has for a trait or characteristic
a)
genotype
b)
phenotype
c)
karyotype
d)
gametes
24.
The physical appearance of a trait or characteristic
a)
genotype
b)
phenotype
c)
genetic code
d)
RNA
25.
The expressed form of the trait when two different alleles appear together
a)
recessive
b)
redundant 
c)
repetitive 
d)
dominant
26.
The trait not expressed when the dominant form is present
a)
excessive
b)
genetic code
c)
recessive
d)
dominant 
27.
allele pairs separate independently of each other during meiosis
a)
law of segregation
b)
law of independent assortment
c)
homozygous
d)
heterozygous
28.
A genotype in which the two alleles are different
a)
homozygous
b)
heterozygous
c)
divergent 
d)
convergent
29.

Gregor Mendel did experimented on what kind of plants?

a)

Lilacs

b)

Peas

c)

Apples

d)

Sunflowers

30.

A chart or tool that shows all the possible combinations of alleles that can result from a genetic cross.

a)

Punnett Square

b)

Genetic Calculator

c)

Family Tree

d)

Blood Sequence

31.
A couple has two children, both of whom are girls. What is the likelihood that their 3rd child will be a girl?
a)
0%
b)
25%
c)
50%
d)
100%
32.
In mussels, the allele for brown coloring (B) is dominant, and the allele for blue coloring(b) is recessive. For which parental genotypes are 100% of the offspring expected to be blue?
a)
BbxBb
b)
bbxbb
c)
BBxbb
d)
BBxBB
33.
In guinea pigs, the alleles for black hair(B) is dominant to the allele for brown hair(b). Two black-haired guinea pigs are crossed. One of the pigs is homozygous for black hair and one is heterozygous. What percentage of their offspring are expected to have black hair? Create a  punnett square.
a)
25%
b)
50%
c)
75%
d)
100%
34.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
35.
A red flowered plant (FRFR) breeds with a White flowered plant (FWFW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink flowers?
a)
0%
b)
25%
c)
50%
d)
100%
36.
What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?
a)
Ry
b)
RRyy
c)
RrYy
d)
Rryy
37.
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)
0/16
b)
4/16
c)
8/16
d)
16/16
38.
A woman with Type B blood (whose father had type O blood) has children with a man who has Type O blood.
What percentage of their children could be expected to have Type O blood?
a)
100%
b)
50%
c)
25%
d)
75%
39.
Round peas are dominant to wrinkled peas and yellow peas are dominant to green peas. 
Perform a dihybrid cross of two heterozygous parents (RrYy)
What fraction of offspring should be expected to be smooth and green?
a)
9/16
b)
1/2
c)
3/16
d)
1/16
40.
Which of the following crosses will yield only homozygous recessive offspring?
a)
RRYY x RRYY
b)
RrYy x RrYy
c)
rryy x rryy
d)
RrYy x rryy
41.

A white mouse whose parents are both white produces only brown offspring when mated with a brown mouse. The white mouse is most probably __________.

a)

homozygous recessive

b)

heterozygous

c)

homozygous dominant

d)

haploid

42.

Which event during meiosis leads to a reduction in chromosome number from 2n to n?

a)

pairs of homologous chromosomes line up at the equator

b)

DNA undergoes replication

c)

homologous chromosomes travel to opposite sides of the cell

d)

sister chromatids are pulled apart at the centromere

43.

Which is the best description of the events that take place during anaphase II?

a)

the replicated chromosomes become visible

b)

homologous chromosomes line up along the equator

c)

sister chromatids are separated and pulled to opposite sides of the cell

d)

homologous pairs are separated and pulled to opposite sides of the cell

44.

The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?

a)

23

b)

45

c)

46

d)

92

45.

Suppose an animal is heterozygous AaBb, and the traits are not linked. When meiosis occurs, what is the total number of possible combinations of gametes that can be made for these traits?

a)

2

b)

4

c)

6

d)

8

46.

During which phase of meiosis do homologous pairs of chromosomes line up next to one another along the equator?

a)

anaphase I

b)

metaphase I

c)

prophase II

d)

metaphase II

47.

A true-breeding tall pea plant is crossed with a true-breeding short pea plant, and all the offspring are tall. What is the most likely genotype of the offspring assuming a single-gene trait?

a)

tt

b)

Tt

c)

TT

d)

TT or tt

48.

If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous?

a)

0

b)

50

c)

75

d)

100

49.

Recessive alleles may not be expressed because they are

a)

masked by a dominant allele

b)

the least common allele in a population

c)

the most common allele in a population

d)

less likely to have crossing over

50.

The fusion of haploid gametes is called

a)

gametogenesis

b)

meiosis

c)

reassortment

d)

fertilization

51.

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

a)

Incomplete Dominance

b)

Codominance

52.

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

a)

Incomplete Dominance

b)

Codominance

53.

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

54.

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

55.

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

56.

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

57.
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
c)
Independent assortment
d)
Recessive inheritance
58.
How many alleles does an individual have for each trait?
a)
1
b)
2
c)
3
d)
4
59.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
60.
How are Incomplete Dominance and Co Dominance different than a normal Mendelian cross?
a)
There is no difference
b)
The heterozygous genotype has a unique phenotype
c)
There is no heterozygous genotype
d)
There is only one phenotype regardless of genotype.
61.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
62.
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
63.
What is NOT a possible genotype for someone with type B blood?
a)
BB
b)
AB
c)
BO
64.
What is the genotype of a person with type A blood, who had a father with type O blood?
a)
AB
b)
AO
c)
AA
d)
OO
65.
What are the blood types of the possible children that a woman (type O) and man (type AB) can have?
a)
O and AB
b)
O and A
c)
O and B
d)
A and B
66.
What determines gender in humans? 
a)
the X and Y chromosome
b)
chromosome 21
c)
codominance
d)
epistasis
67.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
68.
What type of inheritance is determined by multiple genes located at different loci on different chromosomes and there can be a range of traits?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
69.
How many alleles does someone have for a genotype?
a)
1
b)
2
c)
3
d)
4
70.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
71.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
72.
How many PAIRS of chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
73.
How many PAIRS of sex chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
74.
I have 2 X chromosomes. What am I?
a)
Male
b)
Female
75.
I have 1 X chromosome and 1 Y chromosome. What am I?
a)
Male
b)
Female
76.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
77.
Mike has type O blood. Mike can receive blood from someone who has Type A or Type B.
a)
True
b)
False
78.
Someone with type A blood can receive blood from someone who is type AB.
a)
True
b)
False
79.
A personal with type AB blood has which genotype?
a)
type A
b)
AA
c)
IAIA
d)
IAIB
80.
Which term(s) best describes the inheritance of human blood types? 
a)
incomplete dominance and multiple alleles
b)
codominance and epistasis
c)
codominance and multiple alleles
d)
incomplete dominance and codominance
81.
This pattern of inheritance is when one gene or mutation can have multiple phenotypic effects
a)
Multiple alleles
b)
Polygenic inheritance
c)
Pleiotropy
d)
Codominance

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