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2 Factor Crosses, Incomplete Dominance, and Codominance

Total questions: 35

Worksheet time: 1hrs 3mins

Name
Class
Date
1.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

2.

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

3.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

4.

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

5.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

6.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

7.

What does this Punnett square and the probabilities of the ofspring represent?

a)

incomplete dominance

b)

codominance

8.

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

9.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
10.

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%

11.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
12.
A tall plant (TT) is crossed with a short plant (SS) and a medium plant (TS) results. This is what type of inheritance pattern?
a)
Incomplete Dominance
b)
Codominance
13.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
14.

A black male and white female produced this grey offspring:

a)

Incomplete dominance

b)

Codominance

c)

Complete dominance

15.

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 pink (RW) flowers?

a)

0%

b)

25%

c)

50%

d)

100%

16.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
17.

Aa, DD, Bb, yy are all examples of

a)

genotypes

b)

phenotypes

18.

A roan cow shows codominance in fur color (red and white). What is the phenotypic ratio expected if a roan cow and a roan steer mate together?

a)

4 (Red and White)

b)

1:1 (Red to White)

c)

2:2 (Red to Red and White)

d)

1:2:1 (Red to Red and White to White)

19.
A tall plant (TT) is crossed with a short plant (SS) and a medium plant (TS) results. This is what type of inheritance pattern?
a)
Incomplete Dominance
b)
Codominance
20.
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
21.

Some flowers are controlled by codominance. If red flowers have genotype (RR) and blue flowers have genotype (BB), what would the heterozygous (RB) look like?

a)

Speckled blue and red

b)

Purple

c)

Red

d)

Blue

22.

Some cat colors are controlled by incomplete dominance. If black cats have genotype (BB) and white cats have genotype (bb), what would the heterozygous (Bb) look like?

a)

Black

b)

White

c)

Grey

d)

Tuxedo

23.

What inheritance pattern is shown here?

a)

Incomplete Dominance

b)

Complete Dominance

c)

Codominance

24.

The different forms of a gene are called ---

a)

traits

b)

hybrids

c)

alleles

25.
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
26.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
27.
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%
b)
25%
c)
50%
d)
100%
28.
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
29.
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
30.
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.
31.

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

32.

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

a)

9/16

b)

3/16

c)

1/16

d)

16/16

33.

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

34.

What would the gametes for this individual be?

a)
AB, AB, aB, aB
b)
Ab, AB, Ab, ab
c)
Ab, Ab, Ab, Ab
d)
AB, aB, ab, aB
35.
What goes in box 1
a)

AaBb

b)

AABB

c)
abab
d)
AbaB