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Monohybrid & Dihybrid Cross

Total questions: 20

Worksheet time: 40mins

Name
Class
Date
1.

(Grey fur (G) is dominant over white fur (g) and Black eyes (B) are dominant over red eyes(b))

A male rabbit GGbb crossed with a female rabbit with ggBb.


How many out of 16, have grey fur and black eyes?

a)

4

b)

8

c)

12

d)

16

2.

(Grey fur (G) is dominant over white fur (g) and Black eyes (B) are dominant over red eyes(b))

A male rabbit GGbb crossed with a female rabbit with ggBb.


How many out of 16, have grey fur and red eyes?

a)

4

b)

8

c)

12

d)

16

3.
What goes in box 1
a)
AABb
b)
AABB
c)
aabb
d)
AaBb
4.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
5.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds

a)

9/16

b)

3/16

c)

1/16

d)

16/16

6.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
7.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
8.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
9.
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
10.
R= red 
r= green
Which color is recessive?
a)
red
b)
green
c)
both
d)
brown
11.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
12.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
13.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
14.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
15.

Dominant alleles are represented by a:

a)

Male gene

b)

Lowercase letter

c)

Recessive trait

d)

Capital letter

16.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
17.
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
18.
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
19.

What gamete possibilities could come from the parent's genotype: AaBB

a)

AB, AB, aB, aB

b)

Ab, AB, Ab, ab

c)

Ab, Ab, Ab, Ab

d)

AB, Ab, aB, ab

20.

What are the possible genotypes for this cross: Tt x Tt

a)

TT = 25% Tt= 50% tt=25%

b)

all tall

c)

TT= 75% tt = 25%

d)

Tt = 100%