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Monohybrid and Dihybrid Cross

Total questions: 68

Worksheet time: 3hrs 24mins

Name
Class
Date
1.
If you have a parent who has GgBb as their genotype, what are the possible alleles they could donate to their gametes?
a)
GB, Gb, gB, gb
b)
GB, GB, gb, gb
c)
Gb, Gb, Gb, GB
d)
GG, BB, gg, bb
2.
T4 - What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
3.
T4 - Based off this Punnett Square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
4.
Assume mom's gametes are on the left, what is her genotype?
a)
TTZz
b)
TtZz
c)
ttZZ
d)
TtZZ
5.
Assume dad's gametes are on top, what is his genotype?
a)
AAPP
b)
AaPp
c)
aaPP
d)
Aapp
6.
In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?
a)
GG
b)
Gg
c)
gg
d)
green
7.
In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?
a)
0%
b)
25%
c)
75%
d)
100%
8.
One of the two forms of a gene is called a(n)
a)
genotype
b)
allele
c)
hybrid
d)
trait
9.
A genotype is
a)
the listing of the alleles for the trait
b)
the physical appearance of the trait
c)
the separation of the chromosomes
d)
the letters seen on the outside of the Punnett square
10.
This is an example of a ______________.
a)
phenotype
b)
genotype
c)
xenotype
d)
base pairs
11.
The genetic make up of this flower is ________.
a)
homozygous recessive
b)
heterozygous
c)
homozygous dominant
d)
white
12.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?

a)

RrYy

b)

RRyy

c)

RRYy

d)

rryy

13.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
14.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
15.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
16.
An organism’s genetic makeup, or allele combinations
a)
Recessive
b)
Genotype
c)
Phenotype
d)
Heterozygous
17.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
18.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
19.
Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
Rr X Rr
a)
100%
b)
75%
c)
50%
d)
25%
20.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
21.
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%
22.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

23.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
24.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
d)
6
25.
What goes in box 6
a)
AaBB
b)
AABB
c)
aaBB
d)
AAbb
26.

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a guinea pig with the phenotype: short hair with red eyes (select all possible genotypes)

a)

HHbb

b)

Hhbb

c)

hhBB

d)

HHBb

27.

A person with the genotype BBMm could produce which of the gametes below ...

a)

Bb

b)

BM

c)

bM

d)

Bm

28.

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).


Determine the genotype of a horse with the phenotype: curly maned pacer horse

a)

HhTT

b)

hhTT

c)

hhtt

d)

HHtt

29.

In rabbits, grey hair (G) is dominant to white hair (g). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a rabbit with the phenotype: purebred for grey fur with black eyes (select all possible genotypes)

a)

GgBb

b)

GGBb

c)

GGBB

d)

GgBB

30.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

31.

Match the following

a)

homozygous dominant

1.

GG

b)

heterozygous

2.

Gg

c)

homozygous recessive

3.

gg

32.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
33.

When asked to find a phenotypic ratio, we compare...

a)

all different letter combinations among offspring

b)

all the different combinations of "expressed" traits among offspring

34.

what is the genotypic ratio?

a)

1:2:1

b)

3:1

c)

1:1

35.

what is the phenotypic ratio?

a)

1:2:1

b)

3:1

c)

1:1

36.

Match the following

a)

phenotype examples

1.

green round, yellow wrinkled

b)

genotype examples

2.

GgRr, GGRr, ggrr

c)

phenotype definition

3.

physical or "expressed" traits

d)

genotype definition

4.

allele (letter) combinations

37.

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous recessive for yellow, and heterozygous for round?

a)

GgRr

b)

GGRr

c)

GGrr

d)

ggRr

38.

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous dominant for green, and homozygous recessive for wrinkled?

a)

GgRr

b)

GGRr

c)

GGrr

d)

ggRr

39.

what is the phenotypic ratio?

a)

1:2:1

b)

3:1

c)

1:1

40.
Which of the following identifies the phenotypes?
a)
A
b)
B
c)
C
d)
D
41.
Which of the following identifies the gametes?
a)
A
b)
B
c)
C
d)
D
42.
parent 1: GgBB
parent 2: ggBb
Find the gametes for parent 1.
a)
GB, GB, gB, gB
b)
gB, gb, gB, gb
c)
Gg, BB, GB, GB
d)
gg, Bb, gB, gb
43.
Aa is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
44.
bb is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
45.
Recessive alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
46.
AA is an example of 
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
47.
Recessive alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
48.
Which of the following is a genotype?
a)
long hair
b)
blue eyes
c)
Gg
d)
tall
49.
Dominant alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
50.
Which of the following is a phenotype?
a)
AA
b)
AB
c)
black fur
d)
Tt
51.
Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?
a)
100% tall
b)
50% tall, 50% short
c)
75% tall, 25% short
d)
25% tall, 75% short
52.
Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?
a)
100% Gg
b)
50% GG, 50% Gg
c)
25% GG, 50% Gg, 25% gg
d)
75% Gg, 25% gg
53.
Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?
a)
100% Pp (purple)
b)
50% Pp (purple); 50% pp (white)
c)
75% Pp (purple); 25% pp (white)
d)
25% PP, 50% Pp, 25% pp
75% purple, 25% white
54.
An organism with two different alleles for a trait is said to be: 
a)
recessive
b)
hybrid
c)
dominant
d)
purebred
55.
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
56.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
57.
T = tall an t = short
TT and Tt would result in  the following phenotype
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
58.
B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
59.
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%
60.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
61.
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.        
62.
When is a recessive allele expressed in offspring?
a)
when two copies are present
b)
when parents have no dominant alleles
c)
when the offspring is heterozygous
d)
when one copy is present
63.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
64.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
65.
Different forms of genes:
a)
alleles
b)
phenotype
c)
genotype
d)
homologous chromosomes
66.
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
67.
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
68.
If T=Tall & t=short, what is the genotypic ratio?
a)
1:3
b)
3:1
c)
1:2:1
d)
2:2

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